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The biggest LED COB panel yet! Voltage/current tests.

4108 ratings | 191183 views
This thing is huge and bright. It runs at around 12V, but has no integrated current regulation. This means that if connected directly in a vehicle application the current could be very high and the voltage drop across the supply cable will be a factor in limiting the current. The circuitry is basically four large parallel arrays of LEDs connected in series to make up roughly 12V combined forward voltage. I did some voltage/current tests as follows:- 10V 7mA 70mW 10.5V 170mA 1.8W 11V 790mA 8.7W 11.5V 1.72A 19.8W 12V 2.85A 34W 12.5V 4.2A 52W 12.8V 5.2A 66W Current Limit of bench supply. As you can see form the voltage to current ratio the current increases significantly with a small voltage change. A typical eBay search for this might be:- https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313.TR0.TRC0.H0.X70w+led+cob+panel+12v.TRS1&_nkw=70w+led+cob+panel+12v&_sacat=0&LH_TitleDesc=0&_sop=15&_osacat=0&_odkw=70w+led+cob+panel&LH_BIN=1&LH_TitleDesc=0 If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
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Text Comments (635)
Lumens?????????
Muan st (15 hours ago)
stop experimenting like a kid's
Всё грязнить необходимо. Расколупал. Ручонки для тебя отколоть нужно!
Roger Caballeda (7 days ago)
For the first time...I can't see 4x8 led
john koch (11 days ago)
Bought this based on this Video great buy!
Armin Ulrich (11 days ago)
Sorry I am new to electronic fabrication, Is there a way to solder a connector to the board I would like to experiment with rigging 4 boards and I would not want to re-solder connections all the time. I am assuming that if the boards are wire serially I would need to provide n*12v where n is the number of panels linked in series.
Prolific Invention (12 days ago)
I remember the first intensely blue and red LEDs of any worth coming out in the late 90's as cellphone antenna tip add ons...they were a fad for those early rich kid phones but inspired me to build my first LED growlight in 1997 for the low cost of $900 for the bright white, blue, and red plastic q tip sized LEDs found through research on Sierra Online...although my memory is a little fucked from all the high quality Cannabis I bred using that light and the 600 watt Gavita mirrored bulbs....ahhh the 90's
runforitman (12 days ago)
I always thought it was cob as in corn on the cob lmao
bigclivedotcom (12 days ago)
To be fair, the lamps called corn cob lamps are named after their appearance.
Daniel Horne (17 days ago)
for the panel in the video Power: 70W Input Voltage: DC 12V-14V Current: 13A
Leisure Pleasure Audio (22 days ago)
What does "cob" mean?
bigclivedotcom (22 days ago)
Chip On Board. The bare LED chips are bonded to the panel directly.
Electric Poliville (24 days ago)
the bus bar is on the bottom and on the right you can tell by slowing the video while it blinks on.
nemis16 (24 days ago)
It seems to be a little door for the heaven
Rifai A. L (25 days ago)
Can you help me build an RGB LED strip strobe light for use with my levitating water effect project? The color combination of RGB strobe LED's must be selectable.
Sincerely Yours (1 month ago)
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!
Ray Keane (1 month ago)
Sounds like the individual LEDs are wired in a ladder network instead of seires / parallel
Tadesan (1 month ago)
This style of troubleshooting is just what surgeons do!
kenan bakıcı (1 month ago)
If we can use these panels for video shots, we do not have to use LED strips to crate a panel. This is a panel ready for the job. We just need a dimmer, a power supply, etc. However, I could not find the CRI information on the product pages. Is there anyone who can inform us if these panels are suitable for video shots?..Will this panel give us good image quality? Please enlighten us.
ChopnTrvp 808s (1 month ago)
10:22 it didnt even bust it??? It continued to light up after you put the screw driver through it, 10:40 it lights back up!!!...
ss (1 month ago)
My .... That's a big one, isn't it.
Joshua C. (1 month ago)
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 ....
yogibear2k10 (1 month ago)
I wonder if Clive has anything in his house that is not destroyed in some way?
yogibear2k10 (1 month ago)
Fair enough. Still I guess it's the only way to see how things work, though, to be honest, I stopped taking things apart about 4 years ago as the art of putting them back together again, successfully I found almost impossible. Though I did manage to change my laptop processor on Monday, without too much damage. Thanks for the reply, Clive. I will definitely come to your next re-union if you can have it in Cheltenham. (Perhaps you could come for the races!)
bigclivedotcom (1 month ago)
Most stuff gets rebuilt or scavenged for the good bits.
Jhebert Dela Cruz (1 month ago)
Is it bought or made?
My name is Lloyd Stovall I live in the u.s., I have some questions for you they're quite unusual because we are experimenting with different designs. Can you give me a call at 313-651-5349, I'm a talk so maybe you should find some time
waptek0 (2 months ago)
5:49 = 2.5 volts per led?!
bigclivedotcom (2 months ago)
That's the voltage most white LEDs start conducting at low current.
MikeJ F (2 months ago)
Have you ever looked at ale express for these, probably a lot cheaper then this price.
BOBBY RIO (2 months ago)
@BIGCLIVE years ago i saw a simliar that scrolled with the name of what you desired to say thru inpur with a vga adapter what i was wondering is if it can be made big enough to say the words that were input ed example maybe 3 feet across 1 foot top to bottom , i have the original input device but not the screen can you or someone help with where to get it made already or design a simple one
bigclivedotcom (2 months ago)
You can buy full colour video walls quite cheaply now. There are also a wide variety of moving message signs available.
Simon Hare (2 months ago)
Slighly incorrect there Clive. For the projector market there are lamps that go up to 500+W in the same footprint as the domestic security lamp, 30/50/100W. Crazy heat dissipation required.
Alasdair Fitz-Desorgher (2 months ago)
Hey Clive, thanks for sacrificing your unit so we don't have to! Your videos are great! I've bought 2x of these to make a large portable floodlight. I calculated that they draw about 5.8A (max) each and I want to power them both off a single rechargeable battery, for about 60-90 mins. So I assume I need about a 18-20Ah battery? Is that correct? Also, would it be safe to power the panels straight off the battery, or would I need some kind of current/voltage limiter - I noticed that you never took your panel up that high! (And if I do need to limit current/voltage what should I use?)... Many thanks in advance for your help! -Alasdair
bigclivedotcom (2 months ago)
That sounds about right for the battery, but I wouldn't recommend running them for long periods of time at full power for heat reasons.
Nathan Dean (2 months ago)
i think the makers are watching your channel..
Daniel Czech (2 months ago)
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.
Oliver Weber (2 months ago)
Can i use it for Plants?
Justintime2grow (2 months ago)
I want to grow some plants with these lol.
EvroNetwork (2 months ago)
Does this thing need heatsink or it runs just fine at 12.8v 5.2A? ...probably needs but I've got to ask
EvroNetwork (2 months ago)
+bigclivedotcom I just wondering can it run at full power without burn itself after a while?
bigclivedotcom (2 months ago)
Any cooling will prolong an LEDs lifespan. I wouldn't run this panel at full current.
Angirasa Acharya (2 months ago)
I bought one of these cobs, but I have a driver that is constant voltage rated for a DC output of 12v +/- 5% and 6.2 amps. 72 watts basically. Shouldn't this setup work, or will I end up burning out my cob? I figured it would be alright because it can't draw more than 6.2 amps, but am not sure if I will be killing the panel or if it'll be alright.
Angirasa Acharya (2 months ago)
I know this would need a constant current driver by the way. But if you think this CV driver setup is going to be alright, I won't have to track down and buy a CC driver.
Dean Waters (2 months ago)
Sweet i have the same measuring tape Wilkos 0.99P tape
adriaan van harrick (2 months ago)
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 !
Sparky UK (2 months ago)
Does it run hot or is that heatsink sufficient?
Sparky UK (2 months ago)
Always to the max!
bigclivedotcom (2 months ago)
It depends how hard you run the panel.
John Smith (2 months ago)
It's just sad that people that know nothing about tech, even the manufactures of infomercial flashlights are so ignorant, that they can't even pronounce the name of the device. It is NOT a "cob L.E.D.", it is a C.O.B. L.E.D. Do you pronounce "U.S.A." as "usa (oosa)? Or I.B.M. as ibm (ibem)? Why would you be able to say "L.E.D." correctly (not lead), but not "C.O.B."? It is an acronym for Chip On Board, and it's pronounced "C. O. B.". It has nothing to do with a corn cob. I thought it was bad when that flashlight commercial was doing it, but come on, a lot of your videos are nice, and I was very surprised to hear you do that. lol, sorry, but it just sounds so wrong.
lazerman121 (3 months ago)
I always thought the yellow was a hard plastic not a soft gell I got my first 10 Wat 9 em miter array recently and it surprised me.
Honeyball Leckda (3 months ago)
Can i drive 2 of these Panels with a meanwell lpv-100 24v 4,2Ampere driver???
bpanther (3 months ago)
Clive... bought this right after your video was released. Could you please tell me how to make it chooch with a 12V car battery? Do I connect it directly or do I need some sort of a driver?? Links to that, please. DIMMABLE would be mandatory. It's 4 months now I have it, and haven't seen it lit yet. THANKS.
bpanther (1 day ago)
Thanks so much for your reply Clive. Sorry just saw it today. I set it up for a street-side fruit vendor's stall today, whom I'm helping out. It does not get hot at all on a 12V car battery. Will put in the 1 Ω resistor soon. So far it has run ok for an hour. Thanks a million again.
bigclivedotcom (3 months ago)
For dimming you could use one of the 12V DC dimmers available on eBay or just use a series of switchable resistors. For running it from a car battery I'd suggest at least a 1 ohm resistor with a high power rating.
shabtronic (3 months ago)
Just got one of these - amazing - running it with 4x18650's a 3A PWM controller ($2.00 ebay) and normal thin wires - it's blazing on full power, well worth getting!! Didn't bother with a heat sink - just glued the 4x18650 holder on the back of the panel - and glued the PWM on there also so it's one unit - super handy! There's enough room on the back of the panel for three 4x18650 holders (if u want longevity) and a PWM controller.
Redfish Incorporated (4 months ago)
Is available in green?
Karol Zwoliński (4 months ago)
if this one is big - look at this one --- https://www.ebay.pl/itm/153127710148
Bill Seward (4 months ago)
does anyone make these in grow lights?
trolo jolo (4 months ago)
asking myself!
Doom2pro (5 months ago)
Indoor Growing of plants.
Diggy Dugit (5 months ago)
Maybe you could show what you are using for power and how to control the brightness
The Outback Tinker (5 months ago)
did you "Tig" it?
John Hoehaver (5 months ago)
Ive purchased 4 of these already. And I've no idea what to do with them 🤣i put 14 volts throu a mini rf 12volt 19amp ( hah) controller and this thing gets so damn bright and the led was stable (as the led controller was smoking and melting down) the entire panel got hot as hell instantly, as opposed to previously on 12 volt 4 amps it took about an hour and a half to reach any type of temp like this. I don't know what kind of power I was putting to it when it got super bright and heated up the entire panel instantly. But I'm guessing you was closer to about 12 amps. Much higher than the rating. I can't find anything that's that powerful to push to this led. Ive burned throu all my controllers. I mean sure are you go online and spend like $80 on something good but i just bought a 12-volt 8 Amp power supply and the bastard only puts out 6 amps. 😒. Can't win for losing 🤣
John Hoehaver (5 months ago)
bigclivedotcom im trying to think of a way to use a pelter thermo..whatever it is as a heatsink. Ive just now been seeing the 12volt ones on ebay for like 2 dollars. Is it the heat that shortens the LEDs life or the current?
bigclivedotcom (5 months ago)
I'd recommend not running this panel hot. It will last a lot longer run at lower current.
Dave Fredrock (5 months ago)
Seems like it could be part of a pretty nice portable "Trouble Light". Somehow regulate some 18650s with an on off switch?
Ray M (5 months ago)
What size resistor would you recommend for using this for automotive use?
bigclivedotcom (5 months ago)
Just an ohm or two rated at a suitably high power.
McFets (5 months ago)
Not being into electronics Clive, is it feasible to connect this baby to a plug in 12 volt 2amp power supply? Or would I need any other electronics to limit current?
Beware of the Wife (5 months ago)
bigclivedotcom thank you sir! In that case I shall risk my newly purchased £6 adapter and send it to you if/when it fails :-)
bigclivedotcom (5 months ago)
That would work, but will probably push the adaptor to its full output. The main current limiting would be the resistance of the wire and any voltage droop of the supply near its full load.
Looks like an iPhone with a yellow screen ..
Edwin Clulow (5 months ago)
I bought a 6500k one. I want to try and make a light for my aquarium. I wonder if the color temp is right?
Ulf Zimmermann (5 months ago)
So I bought a couple of these. As usual one of the sellers who sells everything and has no clue what they selling. They arrived in a simple plastic bag with zero padding and as they put the metal backings to each other, I assumed the worst. Although there are some marks in the yellow silicon, all LEDs are working (surprise, surprise). I had no problems soldering on a cable, set my Hakko to 800F and although the solder was sluggish it made good contact. Powering them on I saw the same issue Clive saw with so many of the larger panels, LEDs are not matched. These are sold as 12V/70W, yet when applying 12V directly they only drew about 1.6A or just under 20W. So I wonder if they should actually run at a higher voltage than 12V, but I haven't found any other listing which doesn't list them at 12V. I am tempted to run them at a higher voltage to see ...
Ulf Zimmermann (5 months ago)
As said, soldering wasn't a problem. The cable lead I used is 18 or 20 AWG, it should not have a problem with the current. My bench power supply isn't good enough to drive much more (listed at 18V 3A, but cut out at 13.2V 3A). I am actually perfectly find running them at 12V 1.6A, they only got up to about 45C in a 15 minute run. Light output was good for the intended use as a table lamp (my wife wants bright lights for beading).
bigclivedotcom (5 months ago)
They do get shipped in a plain bag. I guess the thickness of the aluminium backplate is what saves them from mutilation in the post. For easy soldering to the panel heat the whole LED panel uop first. I put a clothes iron in a vice with the plate facing up and at a low setting to preheat the panel. If the current draw is low at 12V check the actual voltage at the panel connections. You may find there's a significant voltage drop across the cable.
Kayla and Jim Bryant (5 months ago)
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.
bigclivedotcom (5 months ago)
All mine came in plain plastic bags with minimal packing. They seem pretty rugged though.
Rafael Oda (5 months ago)
How the hell this channel wasn't in my life before?!?
Thurnis Haley (5 months ago)
What're the purpose of these?
Lewis Brand (5 months ago)
Why hasn't a mobile phone maker put one of these in the back face of a mobile phone ?
Bob Lob Law (22 days ago)
Not to mention a mobile phone could not provide enough power.
Non - NPC (2 months ago)
Lewis Brand the heat produced wouldn’t be great for the phone I suspect.
ucheucheuche (6 months ago)
Any ideas how I could mod this to be a dimmable studio light, for video?
bigclivedotcom (6 months ago)
You use a current regulator module and a power supply that put out around 14V or whatever the module required as an overhead above the LED panel voltage.
Uwe Polifka (6 months ago)
Has anybody an idea what kind of powersupply can be used for this panels. With a simple 12 V supply the panel draws only 2,85 A but only when it is cold. How much will the current rise when it is hot, maybe 60°C and it will rise a lot. To solve the problem we need a adjustable constant current supply with 12V and 5 to 6 A and the only way to get this is to use a 24V supply with an CC CV step down converter. This is to much effort and not efficient.
tybofborg (4 months ago)
There are adjustable power supplies, but they're more expensive, and unless it's a space-sensitive application, I wouldn't want to drive these LEDs at anywhere near their full power. You don't want your LEDs getting hot, as it reduces their lifespan. It's easier and probably cheaper to just buy more of them and drive them at a lower current with a regular 12V brick.
The Mod Shop (6 months ago)
I've been looking for a decent bench light for some time now. When you posted this I pulled the trigger and bought this because for the price you really can't go wrong. It came in today and I threw together a little mount for it and man is this thing bright! Here is a picture of it installed above my bench. https://imgur.com/a/mwTvLwt
Colin Hickey (4 months ago)
I have a few spare DC-DC converters which are CC and CV so might try one of those first. Was curious what others were doing. Thanks :-)
The Mod Shop (4 months ago)
Colin Hickey I've actually got it hooked up to a custom pcb that accepts an Xbox 360 power supply.
Colin Hickey (4 months ago)
Looks good, what are you using to drive it?
Aldion Sylkaj (6 months ago)
Why is the gel yellow?
bigclivedotcom (6 months ago)
It contains phosphors to convert the blue light from the LED chips to white. LEDs only emit a very narrow wavelength (colour) of light.
Recycle Bin (6 months ago)
can I put butter on it?
Justin Beaird (6 months ago)
What would I use to limit volts & amps if I want to run this off battery? Sorry I am new at messing with this stuff
Leeloo Minai (6 months ago)
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!"?
Lazy Bunny (6 months ago)
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.
MishotPL (6 months ago)
NOOO! if You using sticky tape, You must twist cables, not solder it! And use Hot glue!
al oberdorf (6 months ago)
is this viable as an off grid application for lighting ?
Phil Chandler (6 months ago)
If that's 12 down, it looks more like 30 wide than 20.
JAMES! Since the 70's (6 months ago)
I guess a DC to DC with cc CV would be the best way to use these in a car? I wonder if these would work in headlights or fos lights?
bigclivedotcom (6 months ago)
Too wide for headlights. They'd just spash light everywhere.
John Hoehaver (6 months ago)
Not to bother you but youre the only youtube video woth this led cob... i heated it up like you said and it soldered perfectly. I attached a 12v 3amp ubec to it. On a 4s lipo battery it is bright and constant then it starts to strobe. -not flicker, but strobe. On a 3s lipo its dimmer but it doesnt strobe. When on 4s and it strobes i disconnect and reconnect the power quickly and the strobe starts as soon as i reconnect the power. But if i leave the ubec unpowered for a little bit it will not strobe instantly. I will get a few (maybe 10) seconds of constant light before it starts to strobe. I hear something about a led driver? But i thought a 12 volt 3 amp ubec would work perfectly. Would a small uf compacitor correct this problem? If so where would i put the compacitor at? Its so hard learning this stuff..
John Hoehaver (6 months ago)
bigclivedotcom oh and theres no protection circuitry.( if that means it's like an actual piece of hardware) It's just a regular 4S lipo. Nanotech 1.3mah 4s high c.
John Hoehaver (6 months ago)
bigclivedotcom i bet that does have some play in itaftwr further experimenting. The 3s plays well because it doesnt over heat my 12volt ubec. My 4s makes it extremely hot. I also have 4 18650 batteries in series which is about the same as a 4s lipo (kind of i guess) the ubec about burned my fingers from the heat. I believe even hotter (maybe) than yhe 4s made it. But with the 18650 4s setup the strobing was extremely slow Compaired to the 4s lipo. Im at a loss. A larger ubec would probably solve the problem but then i risk blowing the leds from the amperage. The volts and watts and amps it specified online varied from listing to listing and i don't trust them. And on top of all that I'm a total noob. And im 31 😒 or 32.. sometimes i forget
bigclivedotcom (6 months ago)
Could it be the protection circuitry on you lithium pack that is pulsing on and off? The four cells would put out a peak voltage of 16.8V and may have forced too much current through the panel.
John Hoehaver (6 months ago)
Why wont my solder stick to the pads for??? Do i need a special solder like for soldering nickel battery tabs or whatever?
bigclivedotcom (6 months ago)
These COBs act as a heatsink and cool the iron tip when you attempt to solder onto them. You have to preheat them before soldering. A common clothes iron or hotplate can work if set low enough to avoid damaging the LEDs.
John Hoehaver (6 months ago)
Will regular solder stick to it after i heat up the whole board on that end?
Midnightcat (6 months ago)
C O B
Some Aussie Guy (6 months ago)
I must have! I have no idea what im going to do with it but still...
Corey Hudson (6 months ago)
@bigclivedotcom Found the big brother to this! 300w and massive! https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F253089608231
bigclivedotcom (6 months ago)
There's already one on order.
Josepi Mann (6 months ago)
AvE sent me, said you got good chooch factor. here is a comment for your interaction score. cheers!
David Clark (6 months ago)
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!
bigclivedotcom (6 months ago)
Have you seen the generic LED PAR style lights on eBay? They're cheap enough to consider as a consumable light.
miss misanthropist (6 months ago)
can you cook corn on the cob led panel
metacollin (6 months ago)
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.
HDXFH (6 months ago)
Streetlighting COB
bigclivedotcom (6 months ago)
Street lights tend to have a series of individual LEDs behind lenses to shape the beam for wide coverage of the road. This would be good as an area light though.
Parasoul Renoir (6 months ago)
Start a Kofi to make it better.
john doe (6 months ago)
Please connect it to a battery!
Andy White (6 months ago)
When you popped that poor inoffensive LED, all I could think was NOOOOOOOOOOOOooooooo! I'm glad we have a ruthless hitman to do the deed. Like buying meat at the supermarket, get someone else to take the hit and then take the spoils in a nice clean package. Agree with twocvbloke, the tech is moving at a fearsome rate. candles lasted for 100s of years, Incandescents 1880 (ish). CFLs appeared 2000(ish) developed to a usable source and then have virtually vanished by 2017. LEDs (as a domestic light source) are changing almost daily if you have the time to trawl e-bay. Thing I'd like to see now is a safe way to power the damn things so you can be reasonably confident they won't bite back.
Matthew Iversen (6 months ago)
Let's take a closer luke! :D
Brad Schmidt (6 months ago)
I would laugh loud if I can mounted those led on a tablet, dead tablet perhaps and rigged it to flash brightly if the power button pressed
James Rowland (6 months ago)
"excuse me rambling about, i'm just experimenting" umm... that's one reason why I watch you :D
pistolschlapper (6 months ago)
i have the exact same metre, was about £4 on kenable
Phil Steadman (6 months ago)
Clive I have just purchased this cob for a photographic/video project in cool white. Could and would this run on an ac/dc 12V 80W output driver (as that’s what I have chosen to drive it with)? I have an huge industrial laser cutter heat sink to mount it to. Best regards Phil Steadman
Phil Steadman (6 months ago)
bigclivedotcom thank you Clive!
bigclivedotcom (6 months ago)
It should be OK, but always have a backup plan for lighting.
RWBHere (6 months ago)
Very nice. Thanks BC.
scott fell (6 months ago)
hey bigclive..can u make a free electricity generator?
zwerko (6 months ago)
Before watching - those wires look awfully tiny to pass 5A+ through them to feed this beast. Sure, they're thick enough as to not get too hot and melt under such a current but one has to account for bending and things like that.
kirkb4989 (6 months ago)
Too yellow!!
Guy Fawkes (6 months ago)
Joule thief can run this nicely at 1.2amps 5volts usb power adapter.
VictorCrum Victor (6 months ago)
nice video and Spectacular testing .. i love it
Paul Frederick (6 months ago)
How are you supposed to mount that panel to a heat sink? The Chinese really need to think their product designs through a bit more.
Grow For Peace U.K. (6 months ago)
So could us cheap growers use these to actually grow stuff?..and gotta say I ain't into electronics but damn your voice is calming and you just have to listen lol
trolo jolo (4 months ago)
How is it going. I'm also interested to use it for my tomatoes
Grow For Peace U.K. (6 months ago)
bigclivedotcom may give it a try and blow myself up or something lol
bigclivedotcom (6 months ago)
I'm guessing these might be usable for plants. Especially if they use the correct phosphor gel.
Nik Trp (6 months ago)
Best way to power this unit to make it portable (and keeping the expenses low)?
bigclivedotcom (6 months ago)
AA times 8 battery pack and 1 ohm resistor?
Kevin (6 months ago)
what is the instrument you use to moderate the amps?
bigclivedotcom (6 months ago)
Bench power supply.
Reece M (6 months ago)
Love the cob lights. Got them in my car

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