エミッターが塗布されているフィラメント部分が１V　 塗布されていない所が８V もう片方のエミッターが塗布されているフィラメント部分も１V の電圧配分になり　 予熱が終わると　エミッターが塗布されたフィラメント間の 約８Vで放電が始まり　 管内の水銀蒸気の水銀原子を励起して UVCが出ます

You are so happily ignorant

I believe we used these for darkroom lighting since it was spectral pure in a particular band would not react with black and white paper processing. The lamps were hung from the ceiling and aimed up at the ceiling for a dispersed light. The energy ratings are false. When one considers the power factor being low the lamp will actually be using the same energy as a standard light bulb. Power factoring cannot be measured with standard analog mechanical kilowatt meters. If one had the new digital meters, they can detect the power factor and correct power usage of led lamps. Now in the states power companies must inform customers of power factor correction for billing purposes. Failing to do so would be a violation of their declaration made with the public utilities agency of the states they operate in. If you have a digital meter take the time to check their terms of service registered on your states website, then call your supplier and ask them if they are doing power factor correction billing with your service.

Uranuim fever

I love sodium lamps, this yellow hue at night just feels like a dream, like something else

tune in next episode for plutonium and fluorine

How feasible is it to just sticka lense in front of it and achieve zero divergence? Like obviously not since the manufacturers likely wouldve dont that already especially on the expensive laser, but why not?

Currently a 2W UV-C Led costs around $25-$30, if there would be a working disinfecting lamp made from Leds, that would be very expensive.

1:03 There is another cheap and reusable method for detecting UV-C, in Hungary all banknotes look different under UV-C and UV-A light, so you just put the bill under UV and you can figure out which type of UV is it. The smallest nomination is the 500 forint bill which is equal to $1.40.

0:39 ofc copper

Hello Brian: There’s a new season of Skinwalker Ranch. They have a multiple laser light test & a green laser that has a gap and the experimenters are looking for an explanation. Can you check what they are doing & maybe come up with an explanation? Season 5 of The Secret of Skinwalker Ranch. I’m just a curious viewer. Earlier seasons did have a splitting and bending laser, but that can be explained. The gap is a puzzle-but the infrared transmittal seems promising. Thank you!

What about changing the pole of the magnet ?

I really wish I had fog lights on my van made from bulbs like this!

In Australia they were high pressure sodium bulbs so that colour I didn't associate with a street light

In Saskatchewan SaskPower used high pressure sodium either 100w 150w 250w or 400w bulbs. Also in sentinel style light fixtures they used mercury vapor. We now use LEDs with a warm white light.

the increased activity in the op globe after you touched it is due to the small amount of static electricity that was built up in your body got transferred to the glass, making it more sensitive.

We have one Philips 4W 840lm lamp for our porch light. Since it is on for many hours two nights a week to allow safe access for our milkman I figured it would be worth the expense to purchase. I paid £12 for it two years ago but don't know what they charge now.

There is something charming about a street still lit with older sodium lighting, our road has historic street lamps so hopefully they will never modify them to the clinical LED fittings used on main routes. They have a high failure rate compared to the older lamps. Living in austerity Britain, the streetlights on side streets go off at midnight because of cost, we are used to it now after 15 years of cost cutting, but the old orange glow of sodium meant safety, and not twisting an ankle on broken pavements

i prefer sodium lamps

There's a solution for using LED and preserving the old yellow color: Using 3000k LEDs. In a village of Spain called Pozo Alcón the council has been doing that. I visited that village a year ago and believe me, at night you won't see no difference from the old lights and these ones until you get close to them and see the LED matrix. In fact, not only they consume less energy, but also they seem to emmit less light to the atmostphere thanks to their moders desing.

7:05 the cheapest way to make a travel to Mexico.

I remember when I was a kid I had this metal rod used for cleaning the insides of my trumpet. I'm not sure what metal it was. It looked like stainless steel. When you touched it to the globe you could pull the electricity about half a centimeter away from the outside of the glass. Kids do stupid things and I was one of them. I'm just stupid in different ways now 🤣

5:38 i think the desktop app exploler.exe crashed. when it crashes in windows visita it make the backround only visble. in newer versoins like 8 or above instead of a desktop its a black screen. but u still can use it. i once used google chorme without running exploler.exe u qwill find it on C:\Windows\exploler.exe

I wonder if using glass (bulb itself or the housing) that’s violate/purple in color will it cancel the yellow orange color light and make it more usable…. Purple cancels yellow turning it white like purple shampoo does for blondes that want togo platinum

There goes 10 minutes of my life for nothing! 😒💤

Those sodium-vapor-lamps had only advantage that made them trump absolutely everything else: _Their light penetrated fog_ like nothing else! When you had those above your head (or, rather, your car), it did not matter how foggy it was, you could always see everything. And this is why I miss them.

Newbie here: if I make a red and a green laser line overlapping on a surface, then I will see a yellow color? I have a cnc-machine and I would have a laser line projected on the table to have a precise position reference to align stock materials on it. The line widht of commercial red/green laser is still to big, even after focusing them on the surface. I was thinking to combine red and a green lines to get a thinner yellow line in the middle by making them slightly overlapping... will this idea works? (Obviously I would check the alignment while wearing some magnifying lens.)

5:12 that sounds sounds shavers down my spine lol

Can you get them apart? How would you separate them?

Thank you for the education is lumins I'm going to pay closer attention now I guess the Chinese is good for something

Can you please reccomend me some saftey glasses for this specific laser? Thank You!

I'd like an OPSL, but I also have a large collection of DPSS and direct diode lasers, plus a HeNe. Not sure I'd want to advertise them in a public video, but I think I have a fair enough excuse, as I used to do product development work using lasers for various purposes. I'm also an amateur holographer, but only two of my lasers are capable of making decent holograms.

Boys will be boys I guess👍 "What would happen if"- famous last words😀

What is the name of that spectrometer? I'd like to get one

210 lm/w is insane! I'm still stuck with about 100 lm/w

I like these magnets I want to get some more I have small ones. They can be really useful!

When I was younger most areas used these sodium vapour lamps but there were other areas using mecury vapour lamps with a bluish colour.

Warning ⚠️ 1. 🧲 Strong Neodymium Magnets (Crushing) 2. ☢️ High Radiation (Ionizing) 3. ⚡️ High Voltage (Electricity) 4. 💥 Explosives (Big Explosions) 5. 🔥 Fire (Can Burn Down Fuel) 6. ☣️ Toxic (Lethal)

I flipping adore old incandescent bulbs

The jars look like women's nail paint or lipstick. Lol. Mammals have good management of copper, so a fair amount would be needed to become toxic. Those vodka bottles are for web influencers and other millionaires. I hope they choke on the gold.

This is a tiny amount, look at the scale and output relative to the visible light. This is similar to the blue light scare. Reality check: how much yellow plastics do you have in the bathroom compared to a living room where sunlight goes through 2-3 panes of glass. The big bulbs are to cover a large work area or a yard where the energy is spread out, while a 20W is a dim desk lamp much closer.

Actually, a really cool experiment to try is lighting a sodium flame with a sodium vapor lamp. It creates the illusion of a black flame!

they had there use and were easy for astronomers to filter out that light. Disney used this as a Yellow screen : kzfaq.info/get/bejne/i7elfLmks-DVdJ8.html

You may notice that LED streetlights are often lower lumens than the SOX or SON fixtures they replaced. This is because the improved CRI means fewer lumens are needed for humans to see properly at night in most situations.

Preferred these old lights as LED lights they make it difficult to see car headlights or mask cars headlights

A tesoura de cerâmica foi frescura. Usou chave Philips normal

Surprising nobody made a sodium discharge laser.... That narrow quasi monochromatic 589.6 nm emission should lend itself quite well to coherent emission...

Didn't faraday already did this some 100 years ago and had no luck with it. It seems due to no presence of electric charge and only photons it is impossible to create amy kind of disturbance in light wave. Only strong gravity of stars can bend the light.

Uranium should make it radioactive

I use a 1521lm 12w led bulb al home not sure what rating it os but it is very bright