Even BIGGER "200W" COB LED panel tests.
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- Опубліковано 28 сер 2024
- If I thought the COB LED panel was big the last time, then this is now officially the biggest I've ever seen. It's based on a solid panel of aluminium with a PCB layer laminated on. The COB aspect (Chips On Board) indicates the way the bare LED chips are bonded directly to the PCB layer and bond wires attached between the chip contacts and the PCB. The board has a dam of silicone piped round the desired outline and is then flooded with a layer of phosphor loaded silicone gel to protect the LEDs and convert the blue light from the chips to white.
This panel has a massive 600 LED chips on it in a 30 by 20 array.
The LEDs are wired in rows of 30 parallel chips in series groups of four rows to make up the desired 12V rating. There's no current limiting so any voltage fluctuation will result in wide intensity variation and any cable resistance will have an effect on the current through the panel.
The LEDs are not well matched on this panel so there will be a wide current difference between the chips and it could damage them if run at high current.
The PCB bus bars are arranged to provide as equal a resistive path to all LEDs as possible to ensure that track resistance does not cause an intensity variation.
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I like this channel. Smart dude talks about stuff... In detail.
Even better if those you know to be cracks watch his content 🤓
I love your ability of turning a light emitting diode into a dark emitting diode.
"Dark sucker" - www.rogermwilcox.com/darksucker.html
7:30 "DED" = "dark emitting diode".
I want someone to invent a device to emit anti-photons that counteract regular photons, therefore making things dark, and then sell the product as a "darkbulb"... :D
twocvbloke to use in Darkrooms everywhere?
Or for people to be able to sleep during the day for nightshift work... :D
twocvbloke I’ve had that idea for a while. I reckon it’s an awesome idea, but I’m not the sort of person to work out how to do it hahah
Neither am I, I'm just basing the idea on matter & anti-matter neutralising each other (though in their case, with some powerful releases of energy upon obliteration of each other), I could be talking absolute bollocks though cos I have no knowledge of things like anti-photons, it just sounds cool... :D
I legit thought the "small" one was a phone 😳
And big was iPad?
Is the new Apple 42G Pro Ultra with iFlash.
Peak brightness of 1000000 nits
bigcobdotcom ?
MrClown bigcobdotclive??
Bigclivedotcob
bigcockdotcom
BigCobdotcom, The #1 gay farmer matchmaking site.
Came looking for a Douglas MacArthur pipe and then came a few more times.
To quote Marvin "There was supposed to be an Earth-shattering kaboom!"
Imagine the whole ceiling with these
Is that the "Big Dipper" I see in the dimmed LEDs? 😀
Clive, can you imitate a series parallel array with 1W LEDs to see how much the full power mismatch is? I'm curious to see if it balances out or gets worse. The more even illumination makes me think that it evens out at higher currents...
iamdarkyoshi Great idea.
can one bake eggs on led-overdrive ( the led ovendrive )
With a good heatsink, and a fresnel lens, I bet that would make a awesome street light for ones property.
I've been subbed for quite a while so how could I've missed this vid 🤔🙄?
Who else wants to cover an entire ceiling with these and run them at low power so they don't get hot? That would look wild!
Current limiting it down to 1 or 1.5 amps it would still make a nice panel lamp for the back of a van (camper conversion). But as Clive says current limiting is vital.
I loved the drill torture test ! They are 600 leds on AliExpress COB sold as "400W(50w when 12v)" panels. I wonder if they are the same as they are more costly. They seems to be assembled by many shops on the same boards.
I can't wait for the inevitable goliath COB that is at least one square foot.
Alec J why would they stop there? I'm sure we'll see at least three square foot ones sometime soon. Even if they don't work, doesn't seem to stop them.
Real "Goliath COB" arrays are officially measured in Hectares ;-)
Alec J EEVBlog already uses that size or bigger as studio lights. Each is the size and look of an office ceiling tile, looks like one when off and is powered by a radio controlled constant current supply bought separately. One of his recent video was repairing some of those supplies.
"Goliath COB arrays are controlled by inserting or removing graphite rods into the power supply, keeping supply output within
Or if they make one with the backing the same size as the emitter element, so you can seamlessly array them. Replace the backing element with one that has built in fins or some form of heat sink mountings, and make all electrical connections on the back. Mounting would also be done from the edges or the back side. (None of those edge tracks as they are doing with them now.)
Then the size would be limited by how many in the array you could drive. This would also allow you to make different shapes depending on how you tile them.
6:40 oh yeah thanks for "focusing", that was very helpful.
"Made in CHNA" - Where?
I've seen products made in CHIN, This isn't the worst
😂👍👍👍
Short for CAHOONA?
Council of Household Neutering Apparatuses
EVERYTHING is made in China!
It needs some kind of diffuser to spread the light a bit more, it would make a good general backlighting unit :-).
you can get one from a Broken LCD screen
It'd be fun if they did a mains voltage version, it'd make drilling that hole a lot more interesting, especially if the step-drill hit a live wire....... :D
The nerd version of Russian roulette.
Twotone more like Chinese roulette.
Thank you for using metric and imperial measurements!
I dig it, 6mm hole right in the middle, I thought you were gonna mount it someplace. Boy I was way off.
?
You can also note how amazing the CRI is on the incumbent LEDs ..
That's the main thing I noticed - everything going all haunted hospitally all of a sudden
Still waiting for the smaller ones to arrive! Really tempted to buy this one, although I've no idea what to do with it / where to put it right now!
Be good to see how evenly the LED’s light under higher power than just lowest power.
Also be good to see a spectral analysis for the sake of use in critical colour analysis such as textiles industry, film industry etc.
Thank you for the video's I'm also an electrician and this kind of honest reviews are very helpful.
Clive ... interesting video . Perhaps it would be possible to access the individual sections and use a current regulator on each one . This would be a practical way to avoid the high cost of a prime quality unit .
Also , would a polarizing filter on the lens help with the glare ?
Edit : I see that smaller strip style units are available , perhaps these would be better for current regulator assemblies ... provided that the mismatch of the leds on each panel is not too great .
It would actually be interesting to see that panel slapped across a fully-charged lead acid battery or a power supply of the same voltage. Make sure to collect all the magic smoke so you can put it back in, though.
No go the li-po high current route
Music Central Even better!
The Tyttuutface yeah man around 48volts @ 50amperes would do that board real good, oh yeah, and did I mention smoke
A fully charged lead acid battery will be ~12.6V at rest (which Clive got up to in the video, see 13:39). Just off the charger it'd be a bit higher, but should drop down fast to 12.6 as soon as you start to draw any significant current. Now, 14.4 from a running car w/ proper charging, using decently thick leads, might be into smoke signalling territory tho :-)
I've got 72 2V (Enersys Powersafe DDmP 125-33s) batteries rated 2000Ah each available for testing at work. If that's too much, 48 rated @ 1600Ah as well.
Hahahaha I clicked in this video expecting to see LED experiments and ended up watching the best “LED ring” camera light idea ever hahaha ohhh yeaaahhh!!!
If my LEDs are not matched and I still want to wire them together in such numbers - is there a reasonable way to get it done without adjusting single LEDs?
Omg ... I have to buy some of these! ... :). Lighting for my mobility scooter! ... pimp my ride!
Get a bigger battery else your 11 miles will be down to a 3 mile radius? Or fit a dynamo :)
They call that the Jaywick special.
put a windfarm on the bike - electrify while drive . . one fan for free
portable nuclear reactor would be the go. Im sure russia would sell one to you.
Xaviera Yayaell
, Are you talking about Jaywick Essex ?
Your camera didn't want to know about more accurate focusing, the cheat sheet was sharper before the refocusing. Is your camera disagreeing with your videos maybe? 🤭
Yeah, sometimes it gets a false focus. I didn't spot that until I saw it on a bigger screen.
I think it's messing with you, Clive. It has its own sinister agenda. 🤣
holly crap...that's big...i've never saw such a big cob...
You were insinuating that these may be factory rejects, that is, somewhere else you can buy these with all beautifully matched LEDs at a much higher price, and you can run those at or near the 200W.
But running LEDs well below their maximum design power is well worth it in terms of Lumen/W so surely, buying one of these could actually make economical sense, given the low £/LED.
Should we pass a hat around and buy Clive a decent lux meter? It would be interesting to know how close these things are to spec.
I've got a couple of basic light meters, but the tests would have to be done in a very controlled area.
bigclivedotcom Wouldn't a darkroom suffice, or a dark room in a pinch?
bigclivedotcom cardboard box
A interesting subject for a video would be lightning strike detectors they seem pretty interesting
With an appropriate case and low current, these would make excellent SAD lamps (seasonal affective disorder, ie. bright lights to keep your mood up). Only a simple diffuser needed.
I would be interested to see what the current draw is if the weedy thin cables are replaced with big chunky ones - presumably it would then just be limited by the (thin?) tracks on the PCB.
I'd also like to see what happens if it's suitably heat-sinked and run at 14.7v (i.e. 12v bulk charge voltage) for a while - does it pull 200W? Does it explode in a huge ball of plasma?
Finally, say I do want to plug it into a battery - what's the best (cheapest/safest) way of limiting the current to something sensible?
You could use a few 1 ohm resistors either in series or parallel depending on how bright you wanted it, but they would possibly get hot.
watching this on an HDR monitor makes me want some goggles myself
Now come on Clive, that's not fair!
You know how long shipping takes from China, the 70W one hasn't even arrived yet!
Somewhat glad the larger one is poor, I'll put the 70W one on a heatsink with a DC/DC and makita battery holder so I have a mobile worklight.
stefantrethan same here... Shit takes like a month to arrive.
Yea but you can't complain about free shipping.
just sing "i'm going to get you on a slow boat from China".
I need walls and ceilings like this.
To die of mental strain from all the light
Like always, you do a great review of products.
I've got quite a few things from PanPan Supermarket. Not panels like this but I've been pleased thus far. I'll have to check them more closely now.
Sir, firstly, please share the product details and where it is available (in which site - amazon/ebay etc.).
Secondly, is it possible and worth using this in commercial projects, especially industrial projects, from height ranging from 8 meters and above to achieve atleast 350 - 400 lux ? Also, let me know if possible what could be the life of these types of Big COBs on a 24 hour operational conditions ( yes, we will take into account proper current and voltage rating as per the specs provided and mounted on a Heat Sink calculated as per wattage). I appreciate your knowledge in this area and request your guidance and suggestion on this product and similar ones, reply will help us a lot. Thanks
I've just been waching this now. I noticed the panel has a clear "DC 12V" label on it. That would mean it would never run at 200Watts if you put only 12 Volts on it.
It's an interesting panel though.
2:00 if u squint it looks like space invader aliens
No mounting holes for heatsink.
I'm wondering if it would be better bonded with thermal silicone glue to avoid buckling when hot.
bigclivedotcom would be nice if you come across a decent broad spectrum cob for growing plants. (Not for the stigmatized majjy purposes 😄). Looking out for a cheap ass solution. Like comment if you've responded 👍
You can actually use that LED panel as a ring light, the issue is that the light needs to be diffused more, if you had a translucent plastic to send the light through, it might fix your glare issue.
There is even bigger LED COB. For example 500W and 1kW but they are really expensive.
Any COB can be 1Kw, briefly.
I don't really have a use for one of these but is so want one!
would make a cool 'computer' display for a scifi project, i know it would have to be seen in the dark and kept at low voltage but would look cool in a darkened room like a computer console in sleep mode ;) yeh my imagination is weird, thats me for ya x
If you scan the low voltage images of the panel with a QR code reader you get
nothing.
Try DataMatrix
That’s very interesting.
It is a Pokemon
how do you know?
I have the 300watt cob led under test .9 months 24/7 on with 13 volt dc and still going
I think I need to get one of these to experiment with
Clive, when you said die LED, you reminded me of Goldfinger.
That's big enough to melt my face! It's just ridiculous!
i love waching these videos wen u take apart stuff and see how it woks keep going on with the vids!!!! :-)
Nick Desert Clive has lots of videos like this.
damn clivey, your led's are an absolute unit
An Excellent Panel.
Looks like they may be fairy efficient at lower power levels too, eg through a dc-dc converter with current limiter. I hope my 200w 240v cob has matched leds (yet to be tested) thanks for the geat info once again!
The mains powered COBs often have the LED all in series anyway, so it's less critical.
Hope you are not going to plug it directly into the mains like the previous video you did using a smaller cob. It was funny when it went bang though!
Great video. I always enjoy videos from you keep at it !!
I wish you would put where to buy link in your description ! But good videos!
I wonder what these are actually manufactured for,never seen anything using anything this size or it’s smaller brother
Maybe for ceiling lights that span the whole ceiling or are just that big? For lights used in exhibition installations? Would also make sense as a video production light, but i haven't seen any made like this and i don't think CRI is all that up to snuff, not with that kind of mismatch.
did you have to move it at 0:40 i was half way through counting the led's :)
Mount a clock module in the hole. Run it so it's glowing reasonably dimly.
Actually a common "12V" lead-acid car battery is slightly less than 14V without load, when in good shape and fully charged. If you pull 200W from it, the voltage will quickly drop, and the actual wattage through that cob connected to car battery will probably fall well below 100W within a few seconds as it needed 12.61V to pull 5.06 amps.
200 watt? I don't understand how you could dissipate that much heat through a static heatsink only, at least if you want any life from it. You would definitely need cooling fans with a heatsink.
There are filters photographers use to eliminate glare and reflections.. it’s not an ND filter or if filter but I believe a polarizing filter.. you just rotate them until it blocks the light you want eliminated and is used in shooting cars or water or really anything shiney and would be perfect when used in conjunction with your ring light here!!! Awesome stuff and new sub!
I think the polarising filter works best with distant point sources like the sun.
Wtf this is beast
Ended an interesting object
Thanks for sharing 😀👍
The focus was better BEFORE using the cheat sheet :)
4 rows x 4 groups is only 16 rows, but there are 20 rows, so it must be 5 rows x 4 groups or 4 rows x 5 groups. At 13:39, it shows that there are 4 rows lit plus the one row you shorted out, so that makes it 5 rows x 4 groups. Just a minor detail.
Do all LED manufacturers have to match chips on their LED panels or just the cheap ones? I would think that good process- and quality control would eliminate the need for high-end manufacturers to match their chips.
16.66A at 12v to get 200w, that is an insane amount of juice for LEDs in general lol
Thats nice.
Clive, can you upload a short video of you running it at its full 200w for science??? :D Smokey!!!!
You should take one of these outside at night and show us what its like at actually 200 watts. Assuming it survives long enough.
9:33 Why do they run those sideways links between individual LEDs instead of just keeping each string of 4 isolated? I guess the shorting current is being spread across all 30 strings in parallel instead of passing through just the one string you shorted - so the short is less likely to blow the whole string. Also you can drill holes anywhere and strings sort of keep going thanks to the redundancy of the sideways links.... However it makes the array less uniform since you no longer get the forward voltage averaging effect of grouping strings of LEDs together. Now the Vf of all 30 LEDs in parallel has to exactly match otherwise you get a non uniform illumination...
Even the "Made in Chna" label was obviously made in china
I refuse to believe that theory! All labels are made in Germany, at least thats what BMW would have you believe 🤔
When they say 200W, I'm figuring this is the 'equivalent' brightness to an incandescent lamp of 200W. At 4 minutes 31, you are showing 3.01A @ 11.89V = 35.8W x 5.5 (as a rough efficiency multiplication factor comparing circa 600 small LED's running at a reasonably modest 1/17th of a watt (circa 14mA each) to an incandescent) gets you to 196 Watts.
LOL that hole you had drilled in that LED panel looked like there was some speck of dust on my screen.
Made in CHNA. Just perfect
And people say "size doesn't matter"...
2:00 reminds me of an office block at night.
I did consider that it might look nice in a frame.
bigclivedotcom - position enough of them on top of one another and you’ve got a night time city scape.
Have you seen the driverless 150w version? There is also a 150w version of this that is actually "3 cobs in a cob", each 50w cob with its own pads.
Just orderd chips from a german manufactor in sale ....15 chips 20€ only 5watt 400lumen per chip but im pretty sure they will hold longer then one big and cheap panel ...great video as always still
3:00 am ? That’s what says for me . When this was uploaded.
the cheat sheet actually defocused it
it was focused perfectly already
Clive, have you ever worked with or messed with a CAT4101 led driver? Might make an interesting video!
I think calculations where wrong to reach 200W. at 12.6v and 5.05A the panel has 2.5 ohm resistance, therefore V=square root of P*R, so V need to be 22.36 Volts for the panel to reach 200W. If this panel is 12v, i think seller advertised that this panel light output at 12V equals 200W of incandescent bulb output
the big panels still give softer shadows than smaller sources
Is it me or is the very distinct patterns is the Grim Reaper or something similar like a walk sign sideways
Forgive my dumb question: how are you limiting the current? Are you driving with a PWM pulse? I thought that it wasn't possible to limit current and that's why they were doing PWM
I used a current limited power supply. You could use a resistor or electronic regulator to get the desired current through these panels.
Panpan is a good seller. Have a few good exsperances with them. All came in static bags as well.... Good work!
Well, now I know that I can make a hole to screw a heat sink. LMAO!
6:46 it was already quite close on focus
cheap set of polarized lenses would solve the reflection issue to a good degree.
Hello, have you tried put them all leds in series and put under the sunlight to see how many volts you get?
Tip: RPP Nigel Cheese technology
We like lights that can be used to grow naughty flowers.
It seems odd that a power supply is not "on board" by the addition of a few extra surface mounted components.
Blank Steve A proper power supply for these would be the size of a pack of cigarettes and a similar price to the panel itself.
John F. Doe - I have noticed some commercial manufacturers content to use a Meanwell power supply as a "black box" soloution. While being easy; they are quite pricey. It might make sense to make the light more modular. My imagination has a several panels on flexible posititioning arms....Like standard lamps only more grown up :)
I suppose it might be viable to use standard 12V LED power supplies (not the halogen version) to drive panels like these.
+bigclivedotcom the standard power supply sounds like it is optimised for cheapness of construction rather than electrical effiency. Is it worth chasing those saved Watts ?
I watch an American chap called "Greengenes garden" who makes these things. He had the YT channel shut down a while back but it is back up now.
When using this with clips on a car battery the resistor is usually in one of the battery clips.