The High Pressure Sodium Light: Ubiquitous, effective, but good?

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Күн бұрын

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Ever wonder why street lights are orange? For such a fast-paced world technology-wise, it seems somewhat odd that we are still using such a strange color of light for outdoor lighting. Well it turns out it is still a pretty good light source, though with limited use and perhaps a not-so-obvious flaw.
Link to Part 2:
• The LED's Challenge to...
The video from The Engineer Guy:
• Light bulb filament
Some various links:
The Wikipedia Article on Discharge Lamps:
en.wikipedia.org/wiki/Gas-dis...
An interesting source about lighting in general:
www.edisontechcenter.org/Sodiu...
Spectral sensitivity of the eye (this is a bit of a spoiler for the next video, so open with care):
light-measurement.com/spectra...
Technology Connections on Twitter:
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Пікірлер: 3 200

@woody5563 3 жыл бұрын

When I was a little kid, maybe 6, my dad worked as a welder. One day he brought me to work. He would to start his drive at 4am. I remember riding through the city on the bench seat of his 80's Mazda B2000 pickup. This is the first time I remember seeing the glow of sodium lights covering everything I could see in a soft, warm orange light. We lived in the country and I had seen singular streetlamps, but never anything like that. Passing under rows of lights on the urban interstate and through the city. That was over 20 years ago and every time I drive on a road at night lit solely by sodium lights it takes me right back there to simple times with my dad, a humble welder, but still my hero. Technology changes, but I hope there is never a night when there is no sodium light remaining. Maybe I'll tell my grandchildren about the warm, calming glow of the past. But words can never convey the magic i felt.

@lumikaten2733 2 жыл бұрын

Man this is a better story than some books

@Tekape 2 жыл бұрын

I remember that ambience too from my childhood but I always wondered since they made me tired and you don't want sleepy drivers.

@crazydrummer181 2 жыл бұрын

Interesting coincidence. My dad is a welder and drove a 1990 Mazda B2200 when I was a kid.

@FreddyThaRipper 2 жыл бұрын

All this from a video on sodium bulbs? Aight lmao!

@Tazuskii 2 жыл бұрын

@@FreddyThaRipper let the man tell his story it was beautiful

@Rikorage 5 жыл бұрын

That random "Yeah" at 12:22 threw me pretty hard, had a good laugh there.

@MartyMacgyver 3 жыл бұрын

Came here to say that - was quietly listening to this and gaming (also quietly) and yeah, "yeah" made me jump.

@adnanabdillahghifari720 3 жыл бұрын

it's actually at 12:24

@SwokTaronyu 3 жыл бұрын

Waited the whole video so i could experience it myself, was not disappointed

@BeachLookingGuy 3 жыл бұрын

it scared the crap out of me i thought it was a roommate at my door

@eksboks148 3 жыл бұрын

My response to this comment: 12:24

@cameronwilson8561 4 жыл бұрын

As a sparkie (electrician) we were also taught that the orange light is particularly good in areas with fog, similar to the yellow fog lights on cars.

@InstaLabSparti Жыл бұрын

it is. this yellow is very close to the frequency eyes sees best and very penetrative in fog smoke and dust

@zekefleming1 2 жыл бұрын

We have a sodium light above our barn, dusk to dawn every night it’s on. The same bulb has been in place sense 1983. Pretty impressive!

@genediggins8331 7 ай бұрын

What size bulb/watts for the high pressure sodium? I too like the color produced

@yammmit 5 ай бұрын

@@genediggins8331I guess he doesn’t know

@khandapwner6805 4 жыл бұрын

1:01- 1:09 is the best explanation on how a lightbulb works that i have ever heard of.

@mattjw16 3 жыл бұрын

Lol same

@groggers 3 жыл бұрын

bruh how does your name go all across the screen over everything XD

@jusa8130 3 жыл бұрын

Dude your username fucks up the webpage width

@johnlister 2 жыл бұрын

Not quite. Incandescent bulbs were relatively early on filled with inert gases such as nitrogen and argon so that the glass could be made thinner. en.wikipedia.org/wiki/Incandescent_light_bulb#Metal_filament,_inert_gas

@ChemEDan 2 жыл бұрын

Everyone always asks how lightbulb works, but no one ever asks how lightbulb is :(

@CalculatinGenius 4 жыл бұрын

Today i learned that my teacher in 2nd grade wasnt talking bs when she told everyone to never shut off the metal hallide lights in our gym

@vamul1 4 жыл бұрын

why?

@glasseyebird 4 жыл бұрын

I guess because they have such a long warm up time?

@dogwalker666 4 жыл бұрын

@@vamul1 they need about 30 minutes to cool before they can re ignite then they take about 5 minutes to get back up to full output

@groggers 3 жыл бұрын

I remember when this happened once in an activities centre on a school trip, now I seem to have found a resonable explanation!

@xHadesStamps 2 жыл бұрын

I have firsthand experience with metal halide lights being shut off on me

@ybunnygurl 2 жыл бұрын

Well a few years in and by me the city is switching over to LEDS, but after testing my city is using warm light LEDs, not bright white, or daylight. They cast light like a incandescent bulb. Its wonderful, and really cuts down on light pollution and are easy to see.

@denisohbrien Жыл бұрын

could you ask your city to speak to my city and stop using "hospital waiting room blue" leds .. thanks.

@volkhen0 6 ай бұрын

This video is 3 years older then this comment. New street light LEDs are much better than 5 years ago and warmer colors are now available. There new LEDs 3000-3500K are really good and pleasant for eyes.

@circleinforthecube5170 5 ай бұрын

@@volkhen0 as long as its orange and retrofitted into old streetlights the vast populace wont know the difference

@michaelbarry8373 4 ай бұрын

@@circleinforthecube5170 Not orange, amber.

@corneliusthecrowtamer1937 4 ай бұрын

amber isn't a real color @@michaelbarry8373

@TimurTripp2 3 жыл бұрын

In my neighborhood they recently replaced all the sodium bulbs with modern white LEDs. Was kind of disappointed to lose that nostalgic orange glow.

@James1095 Жыл бұрын

It's funny to hear someone refer to the orange glow as nostalgic. The lights used to be white mercury vapor lamps, then in the mid 80s those got replaced by yucky orange sodium lights that make everything look muddy and gross. I've always hated HPS.

@thom1218 Жыл бұрын

@@James1095 It's literally the same spectrum of light as early dawn - I mean I don't have anything against basement dwellers that hate sunrises, but I guess it's just to each his own.

@rastislavstanik Жыл бұрын

@@thom1218 it's nothing like that spectrum

@billybassman21 Жыл бұрын

@@James1095 I hated them too, but the colors have improved and they tend to be a more amber color than orange. What I like about them for street applications is they produce less glare. The neighborhood next to mine switched to LED and while the color looks nice, it hurts my eyes.

@Equinox866 Жыл бұрын

They replaced our street lights with the new white LED one's, now we get that nice purple glow on everything at night

@rizalmuhammad1141 4 жыл бұрын

the stuff I watch instead of sleeping

@apenasmeucanal5984 4 жыл бұрын

Rizal, Muhammad yeah 5 am now...

@TheReaverOfDarkness 4 жыл бұрын

Must be all that light pollution affecting your circadian rhythm.

@millbrick 4 жыл бұрын

nice

@AmrAlOmari 4 жыл бұрын

The stuff I watch to sleep 😴

@Bearbytez 3 жыл бұрын

Went to bed almost 5 hours ago. You caught me.

@bjornroesbeke 5 жыл бұрын

I remember having white street lighting some 20 years ago. Then they changed it to orange. The orange glow makes it "feel" more like nighttime.

@God-yb2cg 5 жыл бұрын

The orange glow makes it "feel" more like nighmare.* Fixed it for you

@Blox117 5 жыл бұрын

the orange makes it feel like the 1800s. no thanks

@wilsjane 5 жыл бұрын

The first generation of discharge street lighting was mercury discharge which was a slightly blue white. They were replaced with high pressure sodium for 3 reasons. More lumens per watt. Less refraction in fog. Lower bulb cost. Because mercury lamps produce a lot of UV and the bulbs are not too bright to stare into, eye damage was always a worry. However, mercury light made buildings look far more attractive.

@crackedemerald4930 5 жыл бұрын

Because it looks like sunset

@machina188 5 жыл бұрын

@@God-yb2cg nightmare*

@avenged110 3 жыл бұрын

I loved these lights. In my city, they would cast a warm glow that covered pretty much everything in a pleasant, relaxed light. Now that they all got replaced with LEDs, there's a tiny cone of very dim white light under the poles and total darkness in between, making them relatively worthless at actually lighting the streets.

@kevinmencer3782 2 жыл бұрын

There are few things quite as beautiful as fresh snow under that orange-red glow.

@sodaodaoda 2 жыл бұрын

@@kevinmencer3782 God, I love that, it was my favorite part of winter. Unfortunately, in my town, almost all of the lights have been replaced by those white LEDs, so I really miss that image.

@johnmickey5017 2 жыл бұрын

@@fitz394 Light has an important function for life, including managing circadian rhythm, so, yes, the pleasantness of light is actually fundamental to how good they are. Second, the directionality and high intensity of LED lights actually creates higher contrast (blacker blacks) in less illuminated areas, which also means they function less effectively for area lighting.

@avenged110 2 жыл бұрын

@@fitz394 Idk about anyone else, but where I am, the LEDs appear significantly dimmer (whether or not they actually are) and provide very little street lighting at all. Compared to how it used to be, it's almost comical and seems to mostly defeat the purpose (by comparison).

@MegaPompoen 2 жыл бұрын

IDK man, where I live they have replaced almost all lighting with LED's and the change isn't in how much of the ground is illuminated, the change is in how much of that light goes into the sky (less light pollution, and you can still see the road). So this might just be a lamp design thing instead of a LED thing

@Doggieman1111 Жыл бұрын

Keep in mind, too, that these orangey lights are more akin to the light coming from the really old gas lights that dominated the scene for decades before. The whiter LEDs are harsher on the eyes at night.

@flat-earther Жыл бұрын

I agree. BTW doggieman I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe. I got it in my about tab.

@the_undead Жыл бұрын

There is no actual evidence to suggest that they harm your eyes or whatever, do they appear brighter at night yes absolutely but your eyes were built to take much more light than that

@bryanmartinez6600 5 жыл бұрын

Let's set the mood to get mugged in an alley. *Flashing Orange Light*

@kacey797 4 жыл бұрын

( 103 likes ) and this is the first comment 😂😂✌🙂

@mevoogle 4 жыл бұрын

@@kacey797 what?

@kacey797 4 жыл бұрын

@@mevoogle 😕 I edited the comment and now it's clearer

@RobotacularRoBob 4 жыл бұрын

In case anyone isn't aware, there is a definite effect on human behavior based solely on color spectrums. In LA some years ago for example, crime was reduced after switching from orange to blue street lights. From irritable to calm all from a change of color.

@reggiestickleback7794 4 жыл бұрын

Robotacular >desk lamp is orange *Intense urge to rape and murder intensifies*

@videolabguy 5 жыл бұрын

I parked my fire engine red bicycle against the lamp post in front of my friend's house when I was about 8 years old (1963 or 4). I stayed until after dark. When I came out, someone had stolen my bike and replaced it with an identical bright purple glowing one! I squalled all the way home! Dad came back with me to see what the fuss was all about. Yep. I caught a case of the Sodium Vapours! If he were still alive, Dad would still be chuckling at me!

@raafmaat 5 жыл бұрын

haha i cant help but think you must have been a slow child :P

@Blox117 5 жыл бұрын

sounds like someone gave you an even cooler bike :D

@raafmaat 5 жыл бұрын

aaron, wait really you didnt get his post? wth man, learn to read

@PSKResearch 4 жыл бұрын

A sodium vapor light would have made the red bike look reddish orange. A mercury vapor light would have made it look purple.

@Sashazur 4 жыл бұрын

PSK Research Mercury street lights probably wouldn’t be in use anymore due to the toxicity of mercury. But it wouldn’t surprise me if those kinds of lights were in use in the 60s.

@Gebieter 11 ай бұрын

I think they give the night a very unique feel. They aren't too obstructing or bright either. I don't want to loose this warm atmosphere. If LEDs take over for economic reasons, I hope we stick at least with the exact wavelengths and illumination patterns we are used to. The technology can change, but the results shouldn't.

@ivysvids 5 ай бұрын

They are removing them all in the UK in my area they are replaced with miserable bright cold white LEDs

@handanyldzhan9232 3 ай бұрын

Especially considering warm colors are better at night.

@xINVISIGOTHx 2 жыл бұрын

Theres a place near where I live that has red street lights. I dont mean they have a red tint to them, I mean pure, bright, ruby red, demon eyes red

@RainWalking 5 жыл бұрын

Love this guys videos. He makes everything feel so Retro but in HD.

@jimbo5635 5 жыл бұрын

He is pretty cool.

@ViviSectia 5 жыл бұрын

Yea. It feels like an old PBS show.

@rjnash2610 5 жыл бұрын

He's sooo camp too :)

@aidanknoll1019 4 жыл бұрын

His style is similar to Captain Disillusion's. In fact, I think KZfaq brought me to this channel because of how much Captain Disillusion I was watching.

@TechnologyConnections 5 жыл бұрын

For a channel with an icon of a light bulb, I sure don't do a lot of videos on lighting tech! Time to change that. Added note: the HPS lamp is not the first mainstream discharge lamp. Mercury vapor technology preceded sodium by decades, so we've already done a massive change once before. We'll look a bit at mercury vapor in my next video, and we'll go a bit more into the history of these lighting solutions. But for now, I hope you enjoy this introductory video! EDIT: In the video, I said I wasn't very good at chemistry. Some people have pointed out that this sort of thing is more studied in physics. Aside from proving that I wasn't very good at chemistry, I am genuinely questioning whether or not I first learned about this in Chemistry or Physics. I am _pretty sure_ we discussed electron orbitals and photons produced when electrons jump to lower energy states (plus I know we learned about ionization in chemistry), but I am _certain_ that we looked at gas discharge phenomena in physics class. So both maybe?

@retired1049 5 жыл бұрын

This video made me think of this: The text for your epilepsy warnings should say something like "It will be safe to look after the tone." Then, you just play a short tone when there's no longer any flashing. That way, anyone who actually is affected by epileptic seizures won't feel as inconvenienced as they usually feel. What do you think? PS: No, I did not come up with this idea.

@Cheese_1337 5 жыл бұрын

no , keep your lightbulb picture

@SeanBZA 5 жыл бұрын

Well, also include in the mercury vapour side the self ballasted lamp, especially the interesting changes required to make them run on 115VAC as well. I do have a small collection of carbon filament lamps as well.

@zick1955 5 жыл бұрын

Soviet union actually used mercury vapor lamps instead of high pressure sodium for street lighting. I remember as a kid, the green white lighting looked very interesting but unfortunately for me they got replaced in 2004/2005.

@SeanBZA 5 жыл бұрын

MV lighting is still common here, though they are rapidly being replaced with LED over time, but they are still used in a lot of fixtures, and are spot replaced with MV when they fail.

@matthewcortes3786 2 жыл бұрын

That soft orange glow always reminds me of drunken teenage summer nights running around the city and sometimes laying on the ground puking my guts out. And that orange glow was always with me

@Creeperboy099 2 жыл бұрын

There’s something nostalgic about sodium lighting Perhaps the memories of road trips to Illinois through the night, or how the property at my summer camp was lit up with these at night, providing a 60hz hum with the cricket ambience

@dsandoval9396 5 жыл бұрын

"Not exactly the safest thing in the world, but it does work." Hehe, my boss says the same thing about me.

@Cra3ier 4 жыл бұрын

D Sandoval you? Hehehehe

@Corvus__ 3 жыл бұрын

Sounds like your boss has a good sense of humor!

@secondace9495 3 жыл бұрын

So i can guess..you did something memorable?

@brovid-19 3 жыл бұрын

Same here

@targetbuddy5 2 жыл бұрын

They say "it"? How rude

@abborne1 4 жыл бұрын

I don't know if it's just me or if you're getting to the science behind it, but every LED street light I've ever encountered was real good at illuminating a one-square-foot patch of road directly beneath it. But with all that extra color accuracy, I can definitely sort of tell the road surface is approximately black and the curb is approximately white.

@kennethmiller3802 Жыл бұрын

We have one out of every 40 lights with some blue-purple light. Not UV, it's visible, not incredibly dark, not blinding bright. I see more than a 1sqft though, these ones seem to accentuate certain paints.

@James1095 Жыл бұрын

The issue is not the light source but the regulations that mandate no light emitted above 90 degrees. This forces luminairs to create a pool of light under them, because if you have a drop lens that spreads it out more evenly that will result in some amount of light going upward.

@jorrit_o 3 жыл бұрын

In my village we have orange led lights in more inhabited areas and white led lights for the main streets. We also have a few of those lamps mentioned in the video. But those are the old ones.

@thelightingenthusiast 2 жыл бұрын

What area do you live in?

@jorrit_o 2 жыл бұрын

@@thelightingenthusiast I’m living in a residential area of a small village in central Germany...

@gentillydanny 2 жыл бұрын

When I was a kid the Interstate system was still being built. I was twelve (1969) when the section near our house was first lit at night and I was amazed how the hundreds of birds that had nested there were so restless and noisy. This went on for awhile until they'd all moved on or died from exhaustion. Circadian cycle into chaos.

@thomashernandez4027 4 жыл бұрын

I love sodium lighting. So easy on the eyes and lights up everything.

@locke103 4 жыл бұрын

there's a certain aesthetic to it i honestly enjoy.

@jessdoritowhale 4 жыл бұрын

My salt lamp gives off a orangeish glow from the salt rock itself excatly like sodium light and my eyes and study sessions are so so chill

@hakim567 4 жыл бұрын

@midnitesquirldog1 HMMMMMM

@anishkumbhar4962 4 жыл бұрын

@@locke103 yeah also gives spooky feel specially when you are walking at night alone

@TheIcpfan23 4 жыл бұрын

@@anishkumbhar4962 Why would you be walking alone or be outside in the first place

@macdaniel6029 5 жыл бұрын

I really love this old style of light. The new LED lamps are too cold. Even the warm ones.

@TheCandoRailfan 4 жыл бұрын

I usually prefer white white, not orange "white".

@Berniebud 4 жыл бұрын

@@TheCandoRailfan "White white" you mean basically blue? White white is absolute shit for night time. Warm tones help people maintain their circadian rhythm.

@Ely-zf4yt 4 жыл бұрын

@@Berniebud only if you sleep with the lights on

@willpower3544 4 жыл бұрын

and they last about a month

@thecommenter578 4 жыл бұрын

According to some studies, white light is better for mental health and even reduces the chances of suicide, meanwhile, the warmer light increase it

@Pjazerlazer 4 жыл бұрын

Alec: "Drum-roll please" *Me: "20?"* Alec: "21" *Me: Dang it*

@dingusmann3003 Жыл бұрын

I absolutely adore that shade of light tbh It has such a nice, almost nostalgic feel

@terencerudkin6425 5 жыл бұрын

as a 'wet' darkroom photographer LPS lights are great because Black & White Paper (not most films) is made to ignore its wave length allowing for a bright room without fogging the paper

@KurNorock 4 жыл бұрын

before watching the video, I am going to say from my experience offroading in the desert, the orange (amber) light does a MUCH better job of cutting through fog and dust. White light just reflects off of the dust/fog and blinds you. Amber light shines through so you can see the road.

@Nostalg1a 2 жыл бұрын

Yes, lights should be placed taking into account their location. Foggy areas with these new LED’s are awful at night.

@3AST-PARK 2 жыл бұрын

I personally love the hue this type of light puts off. Some people I know have started putting led bulbs in their house. It makes it feel so “unhomey” and more like a doctors office the warm vibrant light from the incandescent bulb is the way I’ve seen lights for so long the only thing I’d want to use led for is my headlights in my car and possibly the kitchen since I’d want good visibility for what I’m doin just my opinion tho 🤷🏼‍♂️

@NCHLTII Жыл бұрын

Can't you buy Warm White LEDs?

@Gakulon Ай бұрын

Your wallet would prefer the LEDs

@stephensnell5707 Ай бұрын

@@NCHLTIIyes you can,that type of L.E.D. bulb does exist

@NCHLTII Ай бұрын

@@stephensnell5707 I know

@kenstorm4591 3 жыл бұрын

I'm gonna miss that lovely yellow colour in cities when they are all replaced with harsh LED streetlights. There is one in front in my house that blinks off once in a while. I won't call the city about it because I know "fixing" it means replaced with LED.

@tejasbhandare251 3 жыл бұрын

Thankfully in my city they replaced sodium lamps with similar temperature led lamps

@m2heavyindustries378 3 жыл бұрын

The sooner we get rid of this inefficient boomer crap the better

@marcusborderlands6177 2 жыл бұрын

@@m2heavyindustries378 but it's the same efficiency for the amount of light?

@ShazeemKhan 2 жыл бұрын

I am.in the monority here but I rather the brighter lights

@bleack8701 2 жыл бұрын

@@m2heavyindustries378 boomer crap lol. Spoken like a preteen than has never driven at night. LEDs suck and barely illuminate anything while they irritate the eyes

@jonahbento7649 4 жыл бұрын

Technology Connection: “Discharge Lamp” Me: Then Recharge It

@PrivateMcPrivate 3 жыл бұрын

Lol

@KylesDigitalLab 5 жыл бұрын

This is a really good channel, love your work

@KylesDigitalLab 5 жыл бұрын

Maybe do a video on the failure of HD DVD?

@marktubeie07 5 жыл бұрын

YES AGREE, that would be great. _And yes, I was an early adopter and got burnt :(_

@Dragonfire511 5 жыл бұрын

nice profile pic. oh those times... heheh

@eng3d 5 жыл бұрын

I agree

@PracticalAI_ 5 жыл бұрын

me too, I like your style

@BigRedJed 3 жыл бұрын

They got rid of our orange lamps a couple of years ago in my village in Scotland. On foggy nights the atmosphere is gone. I no longer fear that there could be a ripper around the corner with these white LED lights.

@anthonywilliams8956 2 жыл бұрын

I love these lights. They don't hurt my eyes like the newer cold white LED streetlights.

@stephensnell5707 Жыл бұрын

L.E.D. lights have basically replaced HPS AND LPS LIGHTS AS L.E.D. lights are extremely long lasting and 100% efficient and don't produce no heat

@anthonywilliams8956 Жыл бұрын

@@stephensnell5707 every LED I've seen except for the small Holliday ones get hot!

@stephensnell5707 Жыл бұрын

@@anthonywilliams8956 L.E.D lights don't get hot unlike older lights

@anthonywilliams8956 Жыл бұрын

@@stephensnell5707 the LEDs don't get hot but some of their power supplies do!

@stephensnell5707 Ай бұрын

@@anthonywilliams8956absolutely bullshit that is,L.E.D. Power supplies won't get hot,no L.E.D. power supply would ever get warm as they are made to stay cool the entire time

@dakel20 5 жыл бұрын

Another advantage, and why I really miss sodium vapor lamps, is because broad spectrum LEDs are basically impossible to filter out with astronomy gear. Sodium lights? Nice and easy, pop a filter in and I'm good to go.

@raafmaat 5 жыл бұрын

yes i dont think city hall takes into consideration people with astronomy as a hobby xD

@Eletronicafg 5 жыл бұрын

Low pressure sodium lamps only.

@keiffitz689 5 жыл бұрын

Clear mercury vapor is great for this too.

@CZbanhof 5 жыл бұрын

raafmaat Well it's not like professional astronomers can filter unwanted light any better. I talked to one and LEDs are a serious issue.

@cb1671 5 жыл бұрын

raafmaat They don't, but I think they should. Obviously hobbies take a backseat to safety and energy efficiency, but if it's disrupting the enjoyment of the night sky for astronomers (amateur or otherwise), maybe they can find a different solution that would be more effective for everyone next time these bulbs need replacing.

@rars0n 5 жыл бұрын

Okay, I thought one of the reasons sodium bulbs were used for street lights was that the yellowish color was better for enhancing the contrast of items being lit up. I mean, in Europe fog lights were usually tinted yellow for this reason. Likewise, the silly trend of putting blue headlights on your car is stupid because blue light makes less contrast, therefore objects are harder to distinguish than yellow, or something. So I found this video quite interesting. I was in the Navy and one of my jobs was to monitor personnel dosimetry (radiation levels). We had devices that each person would wear on their belt called a TLD (thermoluminescent dosimeter). There was an element in the cap to absorb neutrons, but what we mainly focused on was the glass capsule stored inside the case. It was basically a wire with some calcium flouride crystals attached to it, and when photons hit the crystal, it would send electrons into an excited state. So every quarter, we'd read the dosimeters by inserting them into this machine, which kept them in darkness and would apply a voltage to the dosimeter which would result in the electrons returning to their normal state... which produced light. So the machine would calculate the dosage received based on how much light was emitted. I was reminded about that when you started talking about electrons. I didn't realize how similar they were. Great stuff!

@Elleaf1 4 жыл бұрын

Curious if you watched his next video which seems to suggest that bluer light is superior for night time vision. Yellow/orange light is more pleasant, but it looks like bluer light is safer

@yeahnoway111 4 жыл бұрын

i'm european and fog lights can not be yellow here, has to be white 🤔

@notmenotme614 4 жыл бұрын

No car is sold in the UK with yellow lights. The best lights Ive used for driving at night were LED headlights.

@iDriveDaily 4 жыл бұрын

French cars were sold starting in 1937 with yellow lights and while it was stated as safety, it had more to do with recognizing who was driving up on you in the night during WWII. Yellow is actually worse for night time driving, but the French government could certainly pick a French car out in the night. This was phased put in 1993 when France conformed to the EU.

@johnsiders7819 3 жыл бұрын

A lot of guys put the blue headlight bulbs in to make people think you have the high discharge headlights that come in cars like a Mercedes .

@henrycalde1991 3 жыл бұрын

I like the Mercury Vapor lighting, the moonlight glow it gives off while illuminating its surroundings

@5roundsrapid263 3 жыл бұрын

We had a mercury vapor light on our porch when I was a kid. It really was a nice cool glow.

@Hagemann666 Жыл бұрын

I absolutely love your videos. You tackle a lot of stuff that I've always wondered about (like how VCRS, sprinkler heads, and - yes - high-pressure sodium lighting work). And you do so in an easy to follow, thorough, friendly, and humorous way. You really speak to my inner nerd. Keep up the fantastic work and thank you for so much entertainment and knowledge!

@daveb5041 5 жыл бұрын

The easiest way to think about how gas discharge lights work is electrons of the atom re bumped up into a higher electron orbital. As they jump back down to their ground state they emit a photon of light at the wavelength directly proportional to the distance it jumped. The bluer the light the more energy the longer the jump. This is why you can't get gamma rays only up to Xrays using electrons there isn't a long enough jump for gamma rays. Also shorter paths have a limit and is why you don't see too far into the infra red. To go lower you need a wire where AC goes down: Hence a 1 meter antenna makes a wave length of 300MHz. The electron orbital acts as a nanometer length antenna.

@awfuldynne 5 жыл бұрын

Dave B Fun fact, unless I was misinformed: You can have gamma rays of a greater wavelength (yes, lower energy) than some X-rays, because when it's known whether high-energy EM radiation came from an electron or nucleus, this information "overrides" whether the radiation is categorized as gamma or x-rays.

@daveb5041 5 жыл бұрын

What defines a gamma ray is that it has a shorter wave length and therefore higher energy then Xrays. Energy is DIRECTLY proportional to wave length. The SI standard is frequency/energy. If it came from an electron jumping it's always xrays the longest path is the balmer series (I think it called that) which emits the hardest xrays. After this electrons can't jump any further so gamma rays are impossible by quantum physics. Any other classification is outdated or wrong.

@Blox117 5 жыл бұрын

the specific wavelengths is why they have such bad color rendering.

@daveb5041 5 жыл бұрын

Yes instead of a broad flat convex curve on a intensity vs wavelength chart they have sharp peaks at specific wavelengths. Totally missing some colors entirely. No green and very weak blue. The highest efficiency lamp is the low pressure sodium but the CRI is so bad that it's hard to see even when it's bright. Those are the dull reddish orange lamps you sometimes see used in military bases. The light makes everything look black and orange no colors to see. About as close to seeing gray scale as possible. Would be cool to see a gray scale lamp or scene.

@Larry 5 жыл бұрын

My local council has just changed the bulbs in out area to bright white LEDs, they're way to bright and give everyone headaches.

@DaniFold 5 жыл бұрын

i feel you

@lucasc5622 3 жыл бұрын

i feel you

@tannerl4143 3 жыл бұрын

i feel you

@Oystein87 3 жыл бұрын

Love the LED lights :P Very efficient and great light! But however some installations have the light spreading wrong and the worst is if they have a bit too cold light. THAT is what CAN give some few people headaches. That's why warm white is better for home use and more than cold white is.

@Harlem55 3 жыл бұрын

Because it's not just white light- LEDs have a tendency to throw off UV.

@Empire526 3 жыл бұрын

I just watched a sodium vapor light turn on during my walk and it reminded me of this video.

@robertmartindale563 Жыл бұрын

When they started replacing sodium with LED, one thing I noticed was how the light seemed to "flow" between the sodium lamps, appearing to leave very little unlit space, whereas the light from the LED units seems more focused, and left very clear delineation between each pole, I tried to make that as clear as possible.

@aflockofseacowsesquire 5 жыл бұрын

I love the orange. Very romantic. Especially in the winter. Also, the light seems to do a better job at lighting stuff than the whiter lights.

@ABaumstumpf 5 жыл бұрын

The orange light due to being such a narrow band only stimulate the red and a bit of the green cone cells and do not stimulate the cone cells - that means your eyes do not adjust as much to the light and the cells them self don't work so hard, giving you far better night vision when looking away.

@plushifoxed 5 жыл бұрын

my favorite thing is when orange light saturates an overcast/rainy night sky and makes it look purple-y and orange-y all at once

@nickwallette6201 5 жыл бұрын

I love LEDs for most lighting, but I think I will miss all the warmth when they've totally replaced incandescent and sodium lights.

@ggesdsdsdsd 5 жыл бұрын

Yeah i really like the pinky/golden/orange light better.

@Stormy2142 5 жыл бұрын

Best 13 minutes about light bulbs I've ever seen!!

@PeterShieldsukcatstripey 3 жыл бұрын

I love the amber street lamps. they make the city at night and the shadows so beautiful.

@richardmoss5934 Жыл бұрын

Growing up in England I was told that the streetlights were orange because that frequency could be seen through the fog.

@Josh_Fredman 5 жыл бұрын

Sodium lamps are one of my favorite things in the world, and their gradual replacement by LEDs in Washington State is the hill I've chosen to die on. I've sent letters to city councils, newspapers, power companies...all to no avail of course. But to me the orange glow of a sodium lamp at night is the very embodiment of peace. There's a lot I'm willing to let go of because of changing times, but this ain't one. ALSO! They're super rare nowadays, but I once lived in a town with low-pressure sodium lamps. It surprised me because my girlfriend's red car was jet black at night. Actually kinda cool.

@Blox117 5 жыл бұрын

you can buy your own sodium lamp if you really like them so much

@user-lq1dk6gr3p 5 жыл бұрын

Sodium lamps don’t save hundreds of thousands of dollars

@danieldaniels7571 4 жыл бұрын

Pete S. As a Phoenix cab driver in the 90s, that orange glow was how I knew I’d entered Glendale at night

@soylentgreenb 2 жыл бұрын

@@user-lq1dk6gr3p LEDs are less efficient and don't save any money. The only way to be able to claim higher efficiency is by having a light cone that is too narrow to fulfil its purpose and chosing a very harsh colour that fucks with people's circadian rythm. Since the light cone is too narrow, they often obfuscate pedestrians and bicycles (they're supposed to have a which lamp in the front and a red light at the back, but they almost never do...); if they're outside of the light cone and there is no snow the dim indirect lighting is *much* weaker than the harsh glare of the LED lamp. I'm not sure they are better than not having street lights at all. LEDs save money by doing less with less. You can do less with sodium lamps too and save energy; that's not efficiency.

@alahollywood 5 жыл бұрын

I really miss the HPS street lighting. Here in LA switched to effing LED.

@EdmontonRails 3 жыл бұрын

Same thing in my city. It looks like a cold, barren wasteland outside with this LED trash, which doesn't help when it's -30 in winter and you want to feel warm.

@m2heavyindustries378 3 жыл бұрын

Go and moan to a retirement home nurse old man, who cares

@Skyhawk1998 3 жыл бұрын

@@EdmontonRails Not so much the lighting technology as it is the color temp - although for a long time lighting LEDs were mostly the cringe-inducing cold white that you speak of.

@EdmontonRails 3 жыл бұрын

@@Skyhawk1998 There are warmer LEDs for sure, but there's catches. Warmer LEDs are less efficient, practically tied with HPS. They also often have bad tints. The blue-orange color temperature scale is only half the picture. There is also a green-purple tint scale that completes the chart. HPS lights have a nice purple tint to their orange. A lot of warm LED lights have a nasty looking green tint. The LED light panels don't look as nice as the HPS bulbs either.

@uvwuvw-ol3fg 3 жыл бұрын

@@EdmontonRails Higher efficiency doesn't mean higher CRI. What's the point of higher efficiency in cool white 6000k LED's if the reduce depth perception, increase glare and eye strain. Even at 5000k LED's can have rosy tint which leads to higher CRI.

@NickBoston 4 жыл бұрын

You have an art for making the most mundane things seem seriously interesting. Thank you.

@RidinDirtyRollinBurnouts 2 жыл бұрын

My whole neighborhood used to have these lights, and it was beautiful at night. Now they're all replaced by insanely fucking bright LED streetlights that keep me up at night. Now it just exists in my memories :(

@thelightingenthusiast 2 жыл бұрын

I remember watching the sodium streetlight outside my house turn on at dusk. I urge to write a letter to the council to bring back the orange glow on my road.

@senateb 5 жыл бұрын

In the future, historians will cite this channel in their research of our times. Making the Patreon credits some of the most valuable real estate on the internet. And your bizarre sense of humor will probably be impenetrable to them.

@h10hunter 4 жыл бұрын

Modern humans won't be baboons which will forget what internet is and will have to re-discover fire

@Chase0The0Bass 2 жыл бұрын

@@h10hunter That is literally the best case scenario. Us having the ability to retain our vast amounts of knowledge and data and also the means to apply it. There exists the possibilities for absolute global catastrophes to send many generations of us into pure survival mode in a new landscape and then having to bring this knowledge back into the fray on mostly fresh eyes. Incredibly rare they may be but it does make for a good movie or show.

@WilliamTermini 5 жыл бұрын

Thanks for shining some light on this subject :).

@TechnologyConnections 5 жыл бұрын

I hope you found the topic enlightening!

@m-th 5 жыл бұрын

Those jokes really brighten my day.

@jameslaidler4259 5 жыл бұрын

Technology Connections One could say it was illuminating.

@DMack6464 5 жыл бұрын

This is a very bright comment thread.

@benderrodriquez 5 жыл бұрын

Yes, it has shone some new light on the topic.

@RichieRouge206 2 жыл бұрын

Really find your presentation style so easy to watch and your explanations very concise! Great video dude.

@captaintruth3219 8 ай бұрын

I bought four of these type of lights back in 1991 pretty pricey at the time but best investment I ever made. I had low pressure sodium but I changed to the high-pressure sodium When they became available. installed them 35 feet at the top of the house I have 2 acres and they light up the whole place. Much better than anything else out there. I don’t use them every night only when I’m gone or if I’m working outside so far 32 years and they’re still working great just as bright as the day I bought them

@AloofObserver 5 жыл бұрын

I prefer the orange glow of HPS over the LED's they're installing atm. I find it easier on the eyes at night. The best option would be for warm (like 2200k-2700k) LED's to be installed, but the idiots who purchase them always seem to choose disgusting 5500k lights.

@oddieboi 4 жыл бұрын

It has nothing to do with people being "idiots" and buying the wrong color LED fixtures. Lower color temperature LED's like you're suggesting are not much more efficient than current quality HPS lamps. By the time you factor in the cost to replace all the street lights in a given municipality, it's not longer viable to replace them with LED's for minor increase in energy savings.

@HDestroyer787 4 жыл бұрын

My street became too dark at night because of those LEDs

@arnemaeschaelck5012 4 жыл бұрын

They switched to a warm white kind of LED in Europe, which doesn't look orange like the older lights, but very natural. Pedestrian crossings always have bright, cold, white lights above them. In cars I actually prefer a warmer tone headlights as well over those snow-white LED's.

@bromidedrag 4 жыл бұрын

I agree. I think it has something to do with the wavelength being easier on your eyes when they’re dilated... night vision. You know how hunters and others use red lights at night so that when you turn the light off your night vision is less disrupted. The whiter or cooler the temp, the more harsh it is on your eyes and they adjust, then when you look or drive in a dark area, they have to adjust back.

@Alaprine 4 жыл бұрын

I get blinded by cars with LED headlights. Seriously, it's almost a hazard.

@munjee2 5 жыл бұрын

12:24 That scared me , wearing headphones and it's like 3 I had to turn around to see if someone else was up

@soylentgreenb 2 жыл бұрын

The low pressure sodium light is even more amazing. It's two close spectral lines so you can filter that shit out when taking astrophotos and it has amazing efficiency for putting out a lot of mellow light that doesn't fuck with your circadian rythm.

@youandiryan 2 жыл бұрын

Man I love this channel. It always talks about things that I'm genuinely curious about!!

@fen7662 5 жыл бұрын

Perhaps it's intentional, perhaps not, but limiting the colors, particularly to low wavelengths (Yellow/Amber and lower into Reds) can diminish the interference of light on night vision. Reds are more difficult to see, making Amber/Yellow lights a safer balance once you reach a poorly lit street or the edge of town (because your eyes need less time to adjust). You can literally output more light and it'll be less disruptive to human nighttime perception than anything in the Green+ range.

@giann3021 5 жыл бұрын

So far, implementations of LEDs I've seen have been spotty and blinding bright white. I'm looking forward to different proposed solutions. The studies on vision he mentions seem like a good starting point to judge whether the efficiency of HPS is real, and the effects each type might have on night visibility. Perhaps some warm white LEDs with diffusers might improve CRI and save us a few bucks in the process. Another thing people haven't mentioned much is how many more insects white light attracts vs mostly orange.

@TomTravelling 5 жыл бұрын

There are no "white" LEDs - like fluorescents, they emit ultraviolet & a phosphor mix makes the white.

@TomTravelling 5 жыл бұрын

If outdoor lights didn't affect our night vision, we could see better beyond the reach of the light.

@giann3021 5 жыл бұрын

+tOM Travelling I know getting "white" out of LEDs is a challenge and that they also tried using RGB instead of phosphor coatings, but why is that relevant to these comments?

@nthgth 4 жыл бұрын

Try getting a municipality to defer to common sense like that though

@Sneaky_Snivy 5 жыл бұрын

sadly the city recently replaced the sodium vapor lights in the streets around me, with cold white LEDs. I like LEDs, they're great, but a cold white just isn't a good colour for nighttime street lamps. especially in the Winter, which is when they replaced them. You almost couldn't distinguish slippy snow from concrete floor.

@Blox117 5 жыл бұрын

if you cant distinguish between snow and concrete I'd say either you are blind, or your city keeps the sidewalks ultra clean.

@dzymslizzy3641 2 жыл бұрын

I remember as a child, coming home from visiting relatives in Marin County, CA, to our home in San Francisco, the lighting on the Golden Gate Bridge was always a definite orangey color. My parents knew then, and told me, that they were sodium vapor lights. It's one of those bits of trivia I learned at a young age, and that has stuck with me these 6+ decades later...

@James1095 Жыл бұрын

The lights on the Golden Gate bridge are (or were) low pressure sodium. Those produce a monochromatic gold light which is quite different from the much more common high pressure sodium lights.

@willmetz1490 Жыл бұрын

Some of the lights still are and it’s funny but for me it was heading the opposite direction

@ashtonsopher29 2 жыл бұрын

I just came across this channel, and have finally gotten the answer to a mystery of life that I've wondered about for literally as long as I can remember. Idk if this is a thing in other places, but when you drive on the Paris périphérique, some of the tunnels/underpasses you go through are lit entirely by what I'm now guessing are some such sodium lamps. What made those tunnels unique though was that everything looked greyscale (well, with a yellow tint) when you went through--and I mean *fully* greyscale, absolutely no colors visible, not like the example of the colorful objects in this video. That was always my favorite part of car rides as a kid, and honestly I still get unreasonably excited when going through those tunnels. It's so cool to finally learn why that happens! Unfortunately these tunnels are way less common now than they were a couple decades ago; many tunnels now alternate between the sodium lamps and a boring white lamp, so you can vaguely see colors even if they're a little wonky.

@mfbfreak 6 ай бұрын

If it looks fully monochrome, it was a low pressure sodium lamp. The high pressure ones are a lighter, golden color with a tiny bit of color rendering

@emiliolopez2023 5 жыл бұрын

There is another really awesome thing about sodium vapor lamps it was used in visual effects compositing. It is a technique pioneered by "Petro Vlahos" for Walt Disney Productions. The technique involves using a prism tuned specifically to omit the orangy color that the lamps give off creating a black mat for compositing. The technique is actually superior to blue screen an produces better quality images with no visible mat lines. A good example of it is Marry Poppins and Bed nobs and Broom Sticks. the only reason the technique was not used more in other films is the fact that Disney own the rights to the process,

@animaToy 5 жыл бұрын

I was also used in Alfred Hitchcock's "The birds".

@what-uc 5 жыл бұрын

You just sent me on a KZfaq detour, very interesting. A video called Hollywood's History of Faking It by Filmmaker IQ is particularly good.

@TheSpliceofLife 5 жыл бұрын

I also remember it could not be used in anamorphic processes.

@42luke93 4 жыл бұрын

I miss when they used high pressure sodium lighting. They were so calm on your eyes! I hate the blue LED ones.

@42luke93 4 жыл бұрын

Mahdi RANA It’s so annoying! I wish they could just make them the color of Hps lighting! HPS is my favorite! The light fixtures themselves look cooler compared to led as well.

@42luke93 4 жыл бұрын

Mahdi RANA I concur! I miss when it used to be night time where I live.

@tejasbhandare251 3 жыл бұрын

Here in india they replaced HPS lamps with a similar temperature LED lamps

@mpred8606 3 жыл бұрын

@@tejasbhandare251 I wish we could change ours to be warmer too

@42luke93 3 жыл бұрын

@Rowdy Everywhere else uses the higher Kelvin lights. At least some places seem to use lower Kelvin variants. I wouldn’t mind LED so much if they were just lower Kelvin.

@rdaltry777 3 жыл бұрын

Double thumbs up for The Engineering Guy link. He was great while posting, shame he hasn't in so long. We really appreciate you, Alec. Keep up the great work!

@spm1209 2 жыл бұрын

Do i care about lightbulbs, dish detergent, or gas burning furnaces? Not even a little. Am i going to bingewatch all of this guys videos cause they're wildly informative and enjoyable? You're god damn right I am.

@CortezEspartaco2 5 жыл бұрын

They still use sodium lamps in my town in southern Spain and, from my experience, pretty much everywhere in Spain. I think there might actually be rules that limit which colors you can use in certain historical areas, as orange-peach light makes stone architecture look way better at night than white light does. I personally like it, even though I chose 5000K LEDs for my home. For street lighting, sodium does a great job of making an area look cozy and is gentle on the eyes, all without the horrendous inefficiencies of incandescent lighting. (Incandescent lights are no longer available in most of Europe, and for good reason.) LEDs, I think, make historic streets look dull while making modern urban areas look more striking. LEDs certainly work for outdoor lighting in non-historical city areas.

@CatsMeowPaw 5 жыл бұрын

I really like your videos. Informative, well edited, very educational without being boring, and good presentation. Don't change.

@squirreltismw8295 6 ай бұрын

I used to love these types of street lamps back in the day they would start up with a pinkish white colour light blue and phase into a elegant yellow to gold colour I loved it when it covered the streets at night time and sometimes make a very faint buzzing soundit was beautiful

@Skeleton-wn2zu Жыл бұрын

3:48 Technology connections: "Sodium vapor lamps rather than using mercury use..." Me: "cobalt!" Technology connections: "Sodium! You guessed it." Me: "Dang it."

@googiegress7459 Жыл бұрын

Nutmeg?

@Skeleton-wn2zu Жыл бұрын

@@googiegress7459 possibly

@wta1518 6 ай бұрын

@@googiegress7459No, it's a dash of cinnamon mixed with crushed pecans.

@gabevee3 4 жыл бұрын

What I remember in the 1970s, the reason for going to the amber (yet another definition of the color! WOOHOO!) street lamps replaced the white because the white street lamps did not cover as much area. There were dark spots where muggers and other criminals could hide. The change did reduce some of the crime.

@10p6 5 жыл бұрын

Because astronomers love them as it is easy to filter the light out compared to white light.

@soaringvulture 3 жыл бұрын

That's low-pressure sodium, which has a nearly monochromatic output. As noted in the video, the high-pressure sodium lamps have a broad-spectrum output although the CRI is low. San José, California uses low-pressure sodium street lights for the benefit of the nearby Lick Observatory. These lights have, as was noted in the video, horrible color rendition and make it impossible to, say, find your car in a parking lot at night because they're all gray.

@kkupsky6321 7 ай бұрын

Forreal. In my neighbourhood we tell the distance down the streets by the white and yellow lights. I’ll never forget those lights and when they came on.

@SRene-ee1xu 2 жыл бұрын

Love your videos with my whole heart, thank you for each one!!

@AlessandroRodriguez 5 жыл бұрын

your passion for lightbulbs in remarkable, congrats for your video

@aldrinlimos5159 4 жыл бұрын

We still have a few of these where I live, and they make it feel more like "night". Any other color lamp besides maybe white and I'd think I was in a horror movie.

@mjstow 2 жыл бұрын

Great video. Your high subscription level is well-deserved. I never miss an episode.

@ItsNotAProblem 4 жыл бұрын

Thank you for answering questions we never bother to ask

@EpicLPer 5 жыл бұрын

Love the good and interesting content, you make me interested in stuff I never thought about before.

@DMack6464 5 жыл бұрын

We meet again..

@BorkBorkDoggo 5 жыл бұрын

I always see your comments in the most random places.

@gaytoaster 5 жыл бұрын

I saw you on gbatemp a while ago

@Valery0p5 5 жыл бұрын

'temp strikes again!

@ignasanchezl 5 жыл бұрын

lol u here too

@EdmontonRails 4 жыл бұрын

My neighborhood used to be covered in a nice, warm light. Now stepping outside feels like walking into a cold, barren waste land.

@thelightingenthusiast 2 жыл бұрын

This is the main reason I hate white LED streetlights. I’d prefer them if they were 2700K or 3000K.

@Zaltic 7 ай бұрын

I love the yellow look. It feels relaxing to me.

@stephensnell5707 Ай бұрын

The white L.E.D. Lights are way better and orangy-yellow lights look awful

@jamestl9301 2 жыл бұрын

The hue is cozy too. I love this hue of these lights.

@centurybug 5 жыл бұрын

This is the best explanation of how a light bulb works I've heard to date.

@giann3021 5 жыл бұрын

Me too. Including the description of electrons jumping between atoms from Wikipedia, which I had never read.

@juhailmarisalminen 5 жыл бұрын

The streetlight bulbs of my homestreet got replaced by LEDs and the warm orangey yellowish color got replaced by cool cold white. It honestly took some of the warmth away from our street. I dont like em. Even if they are slightly more efficient.

@Distress. 5 жыл бұрын

Piste Itse maybe if they replaced them with warm white LEDS?

@raafmaat 5 жыл бұрын

some towns actually use yellowish leds, its a good alternative, but i think alot of towns choose white because its supposed to be safer for traffic

@juhailmarisalminen 5 жыл бұрын

Yeah replacing cold ass leds with warm ones would be an awesome compromise.

@mmushler5887 5 жыл бұрын

Same here, and I hate the white LEDs, I feel they only blind you. The sodium lights were maybe not that bright but they allowed you to actually see much better and further. Besides I liked the yellowish color, you don't need to make night look like it would be a day. Maybe it's just my eyes.

@Lunar_Capital 5 жыл бұрын

m mushler Not to mention these white LEDs do a horrible job at lighting a roadway while it raining.

@roggeralves94 Жыл бұрын

I've found a new channel to be obsessed about! My city's been replacing these with LEDs, and while I actually like the LEDs, I kinda miss these old ones. They're really nostalgic and "cozy".

@msDanielp369 2 жыл бұрын

I love how you're an expert on light

@jonathanlanglois2742 5 жыл бұрын

My town has slowly been replacing the old sodium light with LED as they burn out. The first few were white, but the ones they are installing now are the amber color we are used to. Amber leds do cost more, but there are multiple reason to use them instead of a pure white led lamp. There's an observatory about 50km from my city which makes bright white light a problem. It obscures the night sky. It's also a fact that personally, bright white led lamp make me feel like a deer in headlamps. They are so bright that my eyes have a hard time adjusting between the bright light and the dark surroundings. Bright white light also has been shown to have an effect on sleep patterns. Edit: I made that comment as I was watching. I see that at the end, you mention you'll be addressing that in your next video.

@kenek3924 4 жыл бұрын

"Well it's a special kind of light bulb, thanks for watching" ha ha ha 😂🤣😂🤣 loved that part!!!

@donaldasayers Жыл бұрын

In the UK it's ages since I have seen sodium streetlights. My Dad would not drive a red car, because the sodium light makes them effectively black and harder to see.. The yellow of the sodium also masked yellow indicators quite well.

@flat-earther Жыл бұрын

Hi donaldasayers have you become a flat earther yet? If not I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe. I got it in my about tab.

@donaldasayers Жыл бұрын

@@flat-earther Go away nutter.

@apexone5502 4 жыл бұрын

My subdivision converted to LED lights either last year or the year before last. They're are a little more focused so that the light doesn't scatter into people's homes while they sleep. I'm looking out my window right now (currently 2:43 AM) from my bed and I can barely tell that they're out there.

@valerianmp 5 жыл бұрын

LPS is good for use near observatory since its monochromatic nature means it is easier to filter

@TheHortond 5 жыл бұрын

I can heat my living room with incandescent lights during the winter.

@m2heavyindustries378 3 жыл бұрын

Do you live in a closet? Lucky you

@FSM_Reviews 3 жыл бұрын

I use my old laptop. _Beat that, mate_ .

@jasonvee34 3 жыл бұрын

Just play PUBG full brightness while charging your Samsung

@PrivateMcPrivate 3 жыл бұрын

@Tom Garbo That means they can have DOUBLE uses.A light emitting heater!

@Atlessa 3 жыл бұрын

@@PrivateMcPrivate No joke: there are applications where incandescent bulbs are used for exactly that reason. Terrariums and Lava lamps come to mind.

@LaskyLabs 4 жыл бұрын

I love high pressure sodium. Thank you for explaining them to me finally.

@Vault13CanteenFNV 2 жыл бұрын

Ahh this must be the next interesting and educational video that was uploaded a few years ago that randomly appears in everyone's recommendations. Good vid btw 👍

@istvankovasznai 5 жыл бұрын

"No matter what I say, I'll be wrong" 1:06 - The inside of an incandescent bulb is not vacuum, it's actually a low-pressure noble gas - usually Argon. I guess you were right :)

@thekinginyellow1744 3 жыл бұрын

And IIRC tungsten was chosen not so much for it's high temperature tolerance as for it's low vapor pressure "One atom per universe"