It's amazing to think how LED lighting has evolved in the past 15 years, from large lumps of layered PCBs filled with 5mm or 3mm white LEDs, to flat panels of LEDs like these pumping out 70 Watts of light, it's impressive... :D
@tncorgi926 жыл бұрын
30 years ago I was playing with components in my Grandfather's workshop, making random circuits, and he always told me to take it easy on the red LEDs because they were so expensive. Like a dollar apiece or something. These days we just throw crap away unless we absolutely need to save it for something.
@mathuetax6 жыл бұрын
I guess what amazes me is the sheer light output. The first LEDs I played with (surplus HP and Monsanto) were only useful as indicator/pilot lights where there wasn't a lot of bright ambient light.
@hippopotamus866 жыл бұрын
70 watts of heat and light.
@gordonlawrence47496 жыл бұрын
I was working on LED's for Arrow Electronics (distributor) for lighting back in the 90's. Back then they were really rubbish but it was obvious the tech was on the way.
@Tekwyzard6 жыл бұрын
Similar here. When I was a kid 35 ish years ago, I treated myself to my first LED, a yellow one. Blue ones, white ones, and UV ones weren't even a glimpse in some mad scientists eye yet. Anyway, during one of my dangerous experiments involving a mains transformer, I ignorantly left out the current limiting resistor, and melted the poor thing. It actually stayed lit as the plastic melted, at least until the leads parted company anyway, then I got an electric shock from the dangerously bare mains side as I unplugged it in a panic, hahaha, bloody kids eh?? I doubt any modern LED would even get close to surviving that punishment. I was gutted though, that LED cost me a fortune, and I stupidly killed it. Was lesson learned though. I'm actually using some 30 ish year old red LEDs for a project at the moment, because the colour and brightness of modern ones is just wrong and not in keeping with the setting in which the equipment will be used. I love the colour of those old LEDs :-)
@fogllama6 жыл бұрын
I bought several of the smaller size Clive played with in a previous video. I am using a 555 timer based PWM to dim it, and a 6.8 ohm current limiting resistor. Been running it for hours and it is still running cool. Thank you Clive for finding and playing with these things.
@gorinator6 жыл бұрын
Just want to point out that your video descriptions are top notch. Normally the only suggestion of how the viewers could get something is an Amazon affiliate link, where we find an inflated price. Here we get the right ebay search, with the right filters already on, so that we can get the best possible deal. Thanks for looking out for us Clive.
@mikerhodes91986 жыл бұрын
Take it outside at night and fire it up. Let's see what it looks like.
@JuanHerrero6 жыл бұрын
I like the "dumb", no inbuilt regulation stuff. That way you can put exactly what you want, and run it with no loses with a "barely enough" power supply.
@LazerLord106 жыл бұрын
I really want to buy these, but I don't need any more of them. Time to start a new project, I guess.
@thomasmcdougall6146 жыл бұрын
LazerLord10 make a grow light from them
@agvulpine6 жыл бұрын
Thomas: Just peel off the phosphor?
@NGC14336 жыл бұрын
Use them as tiles in a bathroom...
@NineSun0015 жыл бұрын
Exactly my thought. I soon have a new bench light :-D
@-yeme-6 жыл бұрын
0:30 almost all these ebay sellers are drop shippers. they hold no stock, they never even see any of the stuff they sell. they just list stuff on ebay and pass orders and payment, minus their cut, onto big warehousing and mailing services. thats why you see the same items with the same photos and identical descriptions listed by dozens of different sellers. you could pick any of those identical listings and no matter who you order from, it will come from the same place.
@mrgreenswelding28536 жыл бұрын
yeme that would explain things.
@rodsofgod68636 жыл бұрын
They all are drop shippers!!! All of them..
@Debbiebabe696 жыл бұрын
I just read up about 'drop shippers' yesterday. I always assumed the term referred to people that do business by using services that drop their shipment rather than deliver, for example myhermes, but it in fact a completely different meaning - stockless middlemen that just redivert their orders to China.
@mrgreenswelding28536 жыл бұрын
I just bought one from an Australian seller. It will still take over a weekto get here. Something that should take less than a week.
@gorinator6 жыл бұрын
For some context, it's still called 'drop shipping' if it isn't the entire business model. For instance, where I work we make custom building materials. We drop ship the installation hardware. This way the customer only has to make one order, gets exactly what they need, and doesn't have to pay to ship it twice.
@vicmiller71916 жыл бұрын
I just love you fascination with lighting effects. A very neat panel indeed...Thanks for the Demo.
@FerralVideo5 жыл бұрын
These work VERY well used on a three-cell Lithium battery pack. The full battery voltage is at the full drive voltage of the light. Then, as the battery runs down, the light will gradually dim, giving you a handy indication that your battery's running low. The LED cutoff is just above the safe minimum voltage of a 3-cell pack, so even if you set it and forget it, it shouldn't over-discharge. Only complication is that you may need some way to cool the panel at full power/full charge, until the battery runs down a little. Fortunately though, you have 12v right there if you wanted to connect a fan and heat sink system ....
@fraaggl6 жыл бұрын
Wohaou ! This one is my favorite COB for now on ! I bought two before the end of your awesome presentation !
@superbun2776 жыл бұрын
Warning: This video contains graphic scenes of LED array mutilation.
@condew61036 жыл бұрын
The mutilation does make one cringe, but very good information that the panel is 4 regions of LEDs all in parallel, and then the regions in series for about 12v. I like the redundancy such that one or two LEDs failing open should not appreciably affect light output or longevity. Failing short would probably blow the LED off the board with 5A thru the bad chip. The one aspect of discrete or surface mount panels that I don't like losing is repairability, but if the panel can suffer some failure and keep going, that helps a lot.
@vaio2325 жыл бұрын
:(
@acmefixer14 жыл бұрын
Kind of a shame, ain't it!??!
@Elec-DIY6 жыл бұрын
LEDs on the cob..., run!
@SpydersByte5 жыл бұрын
I'm glad that, with 21 likes and 1 comment, at least 23 people understood this reference :D
@10p62 жыл бұрын
Nice. I put two RGBW panels on my sound bar for graphic equalizer, and the specs says needed 76 watt PSU for each panel of 8 x 32 LED's for 256 LEDs per panel. Well 76 watts blinds you. In reality, even hidden behind speaker cloth, in daylight, the panel is perfectly visible at 2 watts per panel. The sound bar is on my channel if you want to see it.
@AttilaAsztalos6 жыл бұрын
When you went to 5 amps, I had to instinctively squint. Which is utterly ridiculous; I'm still looking only at my monitor's dialed-down backlight...
@leyasep59194 жыл бұрын
that's true and it's a really fascinating psycho-visual behaviour : your brain "feels pain" from the contrast despite the lack of dangerous light. It makes you reconsider what pain is and how it works.
@thedillestpickle4 жыл бұрын
I watch videos of people welding and it's the same thing. I've trained myself to know not to look at a welding arc and I instinctively look away.
@heyidiot4 жыл бұрын
At five amps, Mr. Spock was freed of the parasite, but unfortunately, he is now quite blind.
@tazz16696 жыл бұрын
Thanks Clive another great video. Makes me want to tinker and get the son involved in soldering which is a very useful skill for mending broken stuff, I've fixed lots of stuff over the years sometimes just by resoldering a wire or 2 where most would just chuck it out and buy another. Feel I need to buy some project boards so I can get him away from his Xbox for a while.
@tncorgi926 жыл бұрын
soldering is a good skill to have... I learned when I was a teenager and even though none of my jobs have been the type to require soldering skill, a situation always comes up where something is broken and someone says, "Does anyone here know how to solder?" You can be the one who saves the day and gets remembered when other opportunities arise.
@-yeme-6 жыл бұрын
open his xbox and desolder a wire from something. too sneaky?
@tazz16696 жыл бұрын
yeme only if I wanted to die. Spoke to him today about it and he seems really keen. Result for dad I think, have ordered a few little boards to try out so hopefully my soldering skills are up to the task and he picks up this skill. I'll soon have him watching Big Clive with me :D
@davelordy3 жыл бұрын
The colour temperature of these are around 6000K+ so they make good SAD lights.
@kimsleep41116 жыл бұрын
Sit back, and enjoy..unfortunately kids, the only thing burnt today is Clives image sensor in his camera.
@maicod6 жыл бұрын
or his eyes :(
@furryearrapeuniverse3246 жыл бұрын
Is it weird i find these videos oddly relaxing? Clive's soft voice and smooth lighting in the videos really make me relaxed.
@meowcula6 жыл бұрын
"excuse me rambling about, i'm just experimenting" umm... that's one reason why I watch you :D
@ryandrew80756 жыл бұрын
Saturday mornings aren't complete without a Big Clive video
@iamdarkyoshi6 жыл бұрын
Your favourite 100w LEDs are being sold in COB form now, and they're perfectly even I got some for my garage, they haven't had any issues with dying rows or uneven leds after running them at 90w+ a day
they are intrigingly cheap... less then 6 euros...
@MegaMetinMetin6 жыл бұрын
Luke Den Hartog i find with leds they last forever but its the converter thats dies
@stinkycheese8046 жыл бұрын
A "WHOLE" day? I've ran lots of 10W to 100W COB that lasted 100 hours before dies started dying... You're much better off running something like this at half power and that on a massive heatsink, or closer to 1/10th power if you prefer little to nothing heatsinking it.
@cnerde6 жыл бұрын
Meaning 90+w every day all day... derp.
@SeaJay_Oceans5 жыл бұрын
Looking forward to the 8.5" x 11" sized LED panel. :-) Light up the Night !
@ALAPINO6 жыл бұрын
Seems like a decent low profile light panel to build up from. Too bad the pads seem to be quite small.
@ElmerFuddGun6 жыл бұрын
12:35 - The current went up 10x when that section was shorted out. And that is with the reduced voltage... if it was being run with a higher voltage PS (not current regulated) the current would be very high and limited "by the wiring". Something to keep in mind when wiring it up.
@christopherames55526 жыл бұрын
Only Big Clive Exes can dislike his videos.
@neville31514 жыл бұрын
While i enjoy watching you taking things to bits, very often i buy those items just to check them out for myself. Now i have a large drawer full of assorted little toys.
@Rider19Ih6 жыл бұрын
Thanks dude for making this video with the current testing and such. Been looking into these large COB panels for a project.
@BergRD6 жыл бұрын
Nice! Got some of the smaller types you showed a video or 4 back. They work great and only 1 out of 6 had bad LED's on board but the light produced even at 12v is so overwhelming it's not even noticed. Good stuff and thanks!
@6F6G6 жыл бұрын
For automotive applications this lamp would benefit from having a basic 2 transistor constant current regulator so the light output doesn't vary depending on whether or not the engine is running.
@ArifKamaruzaman6 жыл бұрын
Another cool-to-have LED on the shelf right there.
@christopherames55526 жыл бұрын
Imagine going back in time late 1970's and you forget this board in you pocket.
@dirtrusty72285 жыл бұрын
Instant butterfly effect. WWIII, dogs and cats living together, mass hysteria!
@electronicsNmore6 жыл бұрын
12 rows by 20 is 240 chips. Must have meant 28 across That's a huge COB. Great video!
@ArlenMoulton23 жыл бұрын
He said 28
@VanFlicke3 жыл бұрын
I had to listen three times and still didn’t hear 28. Shrug. No big deal
@TheComputec3 жыл бұрын
@@VanFlicke I think he said 20 to begin with but in later comments, after he murdered the first LED he did say 28.
@4DRC_6 жыл бұрын
In awe at the size of this lad.
@sincerelyyours75385 жыл бұрын
This looks like a really neat idea. Some vendors are now selling an impossibly small looking LED dimmer for this COB array that they say can handle up to 12A and deliver 244 watts(!) on 5-24V DC -- all for $2.75 delivered. Ooooookaaaaaay, lets see if it works. If it does the lamp should work well mounted on a homemade aluminum slide suspended underneath the top equipment shelf of my new electronics bench. Thanks, Clive!
@gordonlawrence47496 жыл бұрын
The first thing that went through my mind was bulkhead light. I'm pretty certain there are some cases roughly the right size for that. They would fit a small PSU too so you could feed them with say 36-48V reducing your feed current.
@DarronBirgenheier2 жыл бұрын
I'm going to install some of these LED light panels in my 1986-vintage motorhome to replace the 12V bulb-type fixtures that are in there now. I will be living in the motorhome full-time (in a static position) starting later today (hopefully!). A few years ago, I installed one in a shipping container house that runs from a PV array and a 200AH 12V AGM battery. I have been VERY impressed by it. It's cheap, and has very "soft" output because of the large area. The motorhome has ONLY 12VDC lighting, so unless I plug in a bunch of extension cords and put up 120VAC lighting, 12VDC is all I can do. Given that I'll eventually be off-grid with the motorhome, 12VDC is actually an advantage for me, as I can run all my lights directly from the PV-charged battery in the RV, without needing to have an inverter on when only lighting is needed. These panels can be easily dimmed, too, so they use just a tiny amount of power to put out plenty of light for most situations, but crank up the knob and they get HELLA bright!
@bigclivedotcom2 жыл бұрын
There are loads of choices for 12V lighting these days. You can also convert just about any light to 12V.
@kaylaandjimbryant82586 жыл бұрын
I ordered eight of these at the beginning of the month, and they arrived today (here in Texastan). Two of the panels (the ones at the top of the stack) were all 100% uniform tested at 9.5V drawing 2 mA. Two had severe non-uniformity, and interestingly both tested drawing 3 mA. Four had mild to moderate non-uniformity, and all but one tested at 3 mA (the other was at 2 mA). one of the severely non-uniform ones has deep scrapes/scratches in the rear aluminum, the other severely non-uniform one had no issues with the backside. The ones I bought were wrapped in very thin foam sheets, and shoved in a plastic bag and mailed in the bag from China. I'm not sure if this is how they are all being shipped (I would hope not), but it is something that everyone might want to inquire about before purchasing. There was not even bubble wrap. My numbers should be accurate, my Fluke 117 is NIST tracable. I'm going to ask for money 3/4ths of my money back from the seller, or replacements that are 100% uniform. I'll update this with the results of that. Oh, in an interesting coincidence, mine came from "valuedresshop" on ebay.
@bigclivedotcom6 жыл бұрын
All mine came in plain plastic bags with minimal packing. They seem pretty rugged though.
@konnorbowen52466 жыл бұрын
Hey Clive. Have you seen the range of tools from Aldi? They have several things like £20 soldering stations and £15 rotary tools among other smaller things such as £3 helping hands and mini vices. Might be an interesting range of products for review and testing.
@Beany2007FTW6 жыл бұрын
Konnor Bowen aye, I picked up one of the soldering stations. I'm sure the temperature is way out on then, but they do definitely adjust their output and the kit itself is fairly clean and straightforward.
@Jkirk32795 жыл бұрын
Aldi America must not carry that stuff.
@johnbrookbank29696 жыл бұрын
New projects in future for sure ! Thanks for the great info !
@braeburnhilliard83406 жыл бұрын
That is pretty neat. It looks like it could be a lot of fun!
@rafaeloda6 жыл бұрын
How the hell this channel wasn't in my life before?!?
@StefanHartmann-hartiberlin6 жыл бұрын
Wow, I must get this... great big COB element ! Many thanks for the info.
@MatSmithLondon6 жыл бұрын
Humble suggestion to dear Clive: would you consider compiling a “Q&A with Clive” video? I ALWAYS want to ask follow-up questions of things I don’t fully understand or want to quiz you on, around the subjects / equipment you cover in your vids. I reckon you assume people know a lot more than they do when they watch your vids (maybe I should just speak for myself!) This could take the following form. 1) announce on a few vids over the course of 4 weeks that you are planning a Q&A, and pls ask questions in comments. 2) select some questions (ranging from “the answer is bloody obvious” to “oooh that’s a good question”) and make an ongoing list. 3) Make a vid and answer such questions. This would be amazing for people like me!
@bigclivedotcom6 жыл бұрын
Hi Mat, I sometimes leave out some detail for time reasons. Inb the past I have done a Q and A video, but I really should do another. I answered the questions while building something.
@MatSmithLondon6 жыл бұрын
bigclivedotcom That’s an infinitely better concept (answer whilst building something). Far less annoying than those pesky Americanised “Q&A with Clive!!!!!1” style titles etc. My partner Anna has just chipped in: “if I were doing a video I’d call it “In Bed with Big Clive” as you listen to his videos at night time in bed, it’s like there are three of us. I do find his voice very soothing though.” Haha
@licensetodrive99306 жыл бұрын
YES! I have found my new front light for my ebike :D
@1kreature6 жыл бұрын
As a public service you should expose more of the wiring on the board and discover if it's safe to drill holes anywhere. Mounting these to a proper heatsink with good/firm pressure will be hard since they have no holes in middle. If it is safe to drill holes in a few locations inbetween the LEDs it would help.
@TheComputec3 жыл бұрын
I really appreciate you sacrificing the panel in the pursuit of knowledge. Just a shame the manufacturers don't share that info on a schematics document. After all they can hardly keep it a secret given the price !! If this was needed for a critical use, such as an emergency illuminated information display it is handy to know how much illumination you lose if one led were to die. Maybe they just don't want to spend the money getting the design info translated into English? or they simply don't care what happens to them once they leave the sweatshop... erm I mean factory !
@alloutofbubblegum81656 жыл бұрын
I think this would be the perfect thing for people that are converting vans into campers. A nice warm white light that would not use that much power and keep the heat down on rather hot evenings.
6 жыл бұрын
Connecting this directly to the potential charging voltage if 14.4V would be very bad though.
@Tadesan5 жыл бұрын
This style of troubleshooting is just what surgeons do!
@jagboy696 жыл бұрын
I think my welding table is about to get some new seriously bright lighting!
@TheFlacker996 жыл бұрын
I got 2 of those driverless led's at 100 watts each. Fantastic light, puts out a ton of heat though with a giant heatsink.
@BenjaminEsposti6 жыл бұрын
One of my biggest pet peeves of Ebay and AliExpress sellers is that they don't often provide a detailed diagram showing the product measurements. That's a key thing to know!
@ianhill201016 жыл бұрын
Good effort for the destruction test. Very informative top guy.
@rodrickau5 жыл бұрын
Sent you coffee, Great video presentation. Should be in all schools. Thanks.
@FryGuyNS6 жыл бұрын
I got one 7" x 8.25" rated for 300 watts! WOW the light output! Needs a huge heatsink to run cool.
@LongPlaysGames6 жыл бұрын
That thing is huge! I probably need one to light my work bench now :)
@DigitalIP3 жыл бұрын
I use smaller 10w versions of these for Yard illumination using an AC-DC 60w 5amp power brick, they do very well for that. I also have 1 on my Tahoe as an extra Reverse/Illumination light connected to a cig lighter adapter.
@ElmerFuddGun6 жыл бұрын
Thumbs up for the wilful destruction... errr... testing! ;-)
@ranger175a2w2 жыл бұрын
Thanks from Texas Clive
@agentbertram47696 жыл бұрын
Excellent video Clive! I must away and order one of these!
@Dannyvirk5 жыл бұрын
So glad you didn't 'TIG weld these', last time you did it was like watching someone beat up R2D2.
@Moostery6 жыл бұрын
I wish PAR meters weren't so expensive. I would like to get a closer look at the spectrum coverage of that COB. It seems like a fun COB to wire up a ton of for an indoor grow light. Nice to see another post from ya, Clive.
@youtubekillerxxl38786 жыл бұрын
Moose 8
@rub3nelmillor4 жыл бұрын
Might be late, but look for MIGRO youtube chanel. He did a good analysis on this one. Cheers
@Karl_Kampfwagen4 жыл бұрын
Nice 👍 12 V solar array, to battery, to lighting, or a regulated 12 V supply would be BOSSSS
@frankheijkamp37926 жыл бұрын
That panel is indeed massive. Clive do you have any way of measuring the Color Rendering Index (CRI) of this thing?
@AwsomeVids836 жыл бұрын
I think I'm going to buy one right now.
@ReeceM696 жыл бұрын
Love the cob lights. Got them in my car
@raymondmucklow37936 жыл бұрын
That is a big ass panel.
@davidclark36036 жыл бұрын
Please, please, please do a video showing how to convert a par 64 fixture to led. We are typical poor, skint and broke musicians. We can all handle soldering irons and we can get the parts off eBay, but, we don’t know how to wire it together! Please help us Clive. You’re the only one who can! Thank you so much for your fantastic videos!
@bigclivedotcom6 жыл бұрын
Have you seen the generic LED PAR style lights on eBay? They're cheap enough to consider as a consumable light.
@GadgetBoy6 жыл бұрын
I might have to get one of these to look at. I recently picked up a 1000x usb microscope. It's good enough to see the bond wires on the COBs.
@javiertorres79705 жыл бұрын
I bet you can make some amazing grow lights, Clive.
@mevk19 ай бұрын
hot clothing iron is vice of knowledge -great tip!
@keaganknapp22376 жыл бұрын
There is a even higher power one on Ebay that I bought and it is rated at 200w and it is in the form of a large circle measuring about 160mm
@superdau6 жыл бұрын
Considering that one single dead LED won't matter, drilling a hole for a small camera lens should be doable!
@PrintingPerspective6 жыл бұрын
This LED look insane :) as I saw it, I immediately thought what kind a project I can make with it! ;D
@victorcrumvictor56656 жыл бұрын
nice video and Spectacular testing .. i love it
@fourzerofour78606 жыл бұрын
Woohoo. Big LED light!
@amorphuc6 жыл бұрын
Seems like it could be part of a pretty nice portable "Trouble Light". Somehow regulate some 18650s with an on off switch?
@hmarc4172 жыл бұрын
He He he I heard your birds chirping faintly in the background. 12:08 cools
@yiravarga6 жыл бұрын
This is the first thing you’ve shown off that I’m really tempted to buy! It’s a very nice looking panel, and I got a lot of cool ideas for this. Could you do some more testing? Would it handle 300W for at least 200 milliseconds? Maybe 100W for 400 milliseconds? With heat sink of course, I never go without a heatsink.
@ImigrentfromMars Жыл бұрын
THis just showed up and I can't believe it's been 5 years already, I bought some of these when you made this video,
@pequodexpress3 жыл бұрын
I have to make a choice between variable voltage supplies. Should I go for a 3v-12v 10 amp regulated power supply or a 9v-24v 5 amp power supply?
@pequodexpress3 жыл бұрын
I also just connected one of these COB panels to a bench power supply. Using a 5v-24v dimmer switch, I was able to click on 100% brightness without the light blinking , though I don't think this was the true 100% brightness, as my bench supply was putting out a max of only16.4v at 3.16 amps (maybe the max for my bench supply), which is only 51.8 watts. This panel should be rated somewhere between 70 watts to 100 watts. My question is what is the ideal DC power supply to get maximum wattage out of this panel? Should I stick with 12v and get something that can put out at least 7 amps, or should I go to 24 volts? I will always be running the light with an LED dimmer switch.
@leeloominai81866 жыл бұрын
So, who else FFded to the end hoping to see a white screen and the author screaming in panic "Help, I am on fire and I cannot see anything!"?
@PsiQ6 жыл бұрын
@ 11:45 .. this really is getting a LED horror movie.. pocking and munching around.. :-/
@funkybobblehat3 жыл бұрын
Hello big Clive. Love your videos and in this one you mentioned that you would not run 70 Watts through this panel. I've just ordered one to play around with I was wondering what controller you might suggest 2 power one or more of these? What you need one controller per panel or could you get one controller to Power four or five of these. I am looking to keep temperatures down and figured this unit could help in that regard. Any help gratefully received. Regards
@Majromax6 жыл бұрын
I think your power supply might be interfering with your audio pickup. I can hear a faint background noise in the video that goes away when the supply is shorted out at 2:03 and 2:26, when the supply presumably drops its voltage to limit current.
@proyectosledar6 жыл бұрын
Woooow, I need that!!!
@AlkDarksniper6 жыл бұрын
Proyectos LED ¡En cuánto lo tengas, yo veré ese video! Saludos amigo. -Un seguidor fiel (aunque nunca comento) jajajaja
@eyeswideshut77323 жыл бұрын
what for, air traffic control? 🙂
@jorditribo943 жыл бұрын
Saludos desde Bariloche!
@larrygall58316 жыл бұрын
Looks like it would make a good under-hood light. Need a protective lens and a resistor though. Using 16 ga. wire with a fuse from the battery would be best.. using a switch like a door switch (button switch that's closed with button out).
@lrastus66926 жыл бұрын
Neat ... Looks like a lot of bang for yer buck (magic smoke included) . Putting one of those in a cheapo rip-off led work light (or even an old quartz halogen type) should make a dandy trouble light .
@volvo096 жыл бұрын
That would be a good way of making a cheap light quite effective. Driven at low power it would probably put out more light than the fixture already had, and stay cool. Still wonder if a real bridgelux or cree cob would be better... and the price is pretty similar. It is amazing how much more light / watt you get out of a "real" led, making you wonder why these exist. These unbranded ones are neat to play around with (i do have some) but they are truly super low end as far as light output goes and need to be cheap... factoring that into a price of more than $10 they are actually a ripoff when cobs that output like double the light for a few bucks more exist, and will actually last.
@richardsandwell22854 жыл бұрын
Mine is dying I think, it is only pulling 600mA now on a 12 volt Lead Acid, I think one or more LEDs are burning out, despite treating it with kid gloves and mounting it on a large Copper Heat sink.
@danielczech5605 жыл бұрын
Thumbs up for your videos! I really enjoy watching them. I bought six smaller COB LED panels with each 50 watts to give my pepper plants a little boots of light for winter time. But they heat up quite fast and i got about 70°C after 7 minutes with one of them mounted to a passive cpu cooling unit. Could you make a video how to build a passive cooling unit for serveral of those in a row? I was thinking about some kind of aluminium plate.
@LazyBunnyKiera6 жыл бұрын
Got any pictures of these things lighting up a back yard or something? Due to how thin it is, i could thing of quite a few uses for such a light.
@metacollin6 жыл бұрын
Really good LEDs at this point will actually dissipate more power in the form of radiant flux than they do in the form of heat, and this can kind of fool our senses. Something that is hot is going to have heat coming off of it if you put your hand near due mostly to convection. With LEDs like these however, most of the heat you feel is actually from the photons impinging on your hand, not because the actual source of the light is hot. It still messes with me, because it feels just like putting my hand near something quite hot, but if I cut power, the heat vanishes, and the COB will be much cooler to the touch than something that could ever have produced the heat I felt on my hand via convection. The newest blue-to-violet LEDs as of 2018 (which are used to make white LEDs of course) have an efficiency of about 72%. Put in 1W of electrical power, and get out 720mW of light, along with 280mW of heat. You can buy them on mouser, digikey, etc, this isn't something in a lab. They're so good they seem almost unphysical.
@budandbean16 жыл бұрын
Where do you suppose you might be able to get a heat sink for something this size? If I could figure out a lens and a way to keep it from overheating, this really could be a great little fog light.
@Doom2pro6 жыл бұрын
Indoor Growing of plants.
@punker4Real4 жыл бұрын
it's winter somewhere
@trey15316 жыл бұрын
This would be good for a solar powered camper or something.
@OtherDalfite6 жыл бұрын
These would be a good investment for someone living in a ford transit or something similar. Two of these could probably light the whole interior.
@richardkaz23366 жыл бұрын
So going off your measurements you could have a single LED mounted in the middle of a 300x200mm back plane and call it a 300x200mm COB?
@fastbike1756 жыл бұрын
Thats a great pannel. How small could a regulator be built for this? Ive put together a rectifier for my wr450 lighting to be able to use LEDs. The single large pannel would make a very interesting replacement for the entire original headlight.
@harrickvharrick39575 жыл бұрын
Actually this array consists of twelve rows that each contain twenty-eight individual chips which makes for a total amount of 336 of em. Instead of twelve times twenty, which by the way would add up to 240 and definitely not 346 even though that number which in itself is quite close to the actual number counted correctly. IF this thing would consume 70 Watts indeed, that would mean a consumption of 70 / 336 = 0.208 Watts per chip , and when we would devide that by 3 as if we supposing the applied voltage per individual LED would ideally be 3 Volts, that gives us a power consumption of 0.06ö4 (say 0.07 Amps or 70 MilliAmps per chip. And as each chip contains three individual, actual LEDs apiece, that gives us an outcome of 0.0231 A or 23 milliAmps per LED. There possibly is a few percents of that that are absorbed by wiring, a few micro components for voltage /surge protection and tp smoothen things out on the circuit and / or on the individual chips as well; taking that on account we still come up with a final actual power consumption that is close to a nice, round 20 milliAmps each LED gets. By the way, I do have a question about this: when the temperature inside the LEDs goes up, does the conductance and with that its own consumption as well as what it can pass through drop as a result? I am aware changes relating to temperate development in the LED /~ chip would need to be measured in nanoseconds. The way LEDs work is they get so hot the variety of individual metallic molecules (for composing the right part of the light spectrum) that are mounted on the tiny little pieces of silicon carrier in them, gets so hot that they start emitting light as a result, uv light which is passed through a layer of phosphorus to give out the right light colour. The LED works basically must like an incandescent light bulb did, but is much more efficient cause it only powers light producing molecules that lay directly on the surface all of which can emit light that can travel into (reach) the outside world ndeed, minimalising the losses in by molecules that are powered and produce loads of heat but are not in a position to bring forth light. Also the conduction is way more stable af sturdy, al the stuff being mounted on a plate that is surrounded by glass and encased / enclosed and it doesn't contain a wobbly filament that dangkes inside and can break by the slightest tremble. Apart from that some of the LEDs adjust to an output of the right (desired) visible light frequency by running the primarily created waved form of the photos it produces (uv) through a layer of phosphorus just like in the fluorescent light sources of the previous generation (tl) and the cathode ray tube in colour tvs (containing the separate photon sources scanning the inside of the tube creating the subpixels and three different types of phosphorus, one for each colour of 'dots' on the screen.. One for red, one for green, and one for the blue ones. It is what the modern ultra-flat LED tv for in common with the old one. Another thing, I do not know what the difference between power consumption and dissipation is, can somebody enlighten me.? Thanx !
@frederick60087 ай бұрын
Have you tested indoor led grow lights?
@jasondoe25966 жыл бұрын
Very very neat! I wonder if I could find some "warm white" ones with known specs... (emission spectrum & CCT). I think you shouldn't underestimate the accumulated heat though, especially if not directly heat-sinked (or actively air-cooled). I don't think over 1A is realistic for 24/7 usage, if you care about its longevity. Then again, this thing is quite cheap for what it is.