I like this channel. Smart dude talks about stuff... In detail.

@christianrottler

3 жыл бұрын

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.

@phils4634

6 жыл бұрын

"Dark sucker" - www.rogermwilcox.com/darksucker.html

7:30 "DED" = "dark emitting diode".

@twocvbloke

6 жыл бұрын

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

@JoelHudson

6 жыл бұрын

twocvbloke to use in Darkrooms everywhere?

@twocvbloke

6 жыл бұрын

Or for people to be able to sleep during the day for nightshift work... :D

@jamesblack8763

6 жыл бұрын

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

@twocvbloke

6 жыл бұрын

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

Like always, you do a great review of products.

Great video. I always enjoy videos from you keep at it !!

I legit thought the "small" one was a phone 😳

@NineEyeRon

3 жыл бұрын

And big was iPad?

@RDCST

3 жыл бұрын

Is the new Apple 42G Pro Ultra with iFlash.

@theaverageblitzer4351

3 жыл бұрын

Peak brightness of 1000000 nits

Thank you for the video's I'm also an electrician and this kind of honest reviews are very helpful.

To quote Marvin "There was supposed to be an Earth-shattering kaboom!"

6:40 oh yeah thanks for "focusing", that was very helpful.

bigcobdotcom ?

@JoelHudson

6 жыл бұрын

MrClown bigcobdotclive??

@johnsonmay3181

6 жыл бұрын

Bigclivedotcob

@scwfan08

6 жыл бұрын

bigcockdotcom

@__aceofspades

6 жыл бұрын

BigCobdotcom, The #1 gay farmer matchmaking site.

@cougarhunter33

6 жыл бұрын

Came looking for a Douglas MacArthur pipe and then came a few more times.

Ended an interesting object Thanks for sharing 😀👍

I've been subbed for quite a while so how could I've missed this vid 🤔🙄?

i love waching these videos wen u take apart stuff and see how it woks keep going on with the vids!!!! :-)

@crawfish069

6 жыл бұрын

Nick Desert Clive has lots of videos like this.

Imagine the whole ceiling with these

Thank you for using metric and imperial measurements!

Is that the "Big Dipper" I see in the dimmed LEDs? 😀

damn clivey, your led's are an absolute unit

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

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.

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!

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.

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!

An Excellent Panel.

With a good heatsink, and a fresnel lens, I bet that would make a awesome street light for ones property.

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...

@NonnofYobiznes

6 жыл бұрын

iamdarkyoshi Great idea.

@herauthon

6 жыл бұрын

can one bake eggs on led-overdrive ( the led ovendrive )

Clive, have you ever worked with or messed with a CAT4101 led driver? Might make an interesting video!

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 .

Clive have you had much experience with quantum boards?would be great to see you do a vid on them.

I think I need to get one of these to experiment with

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.

How do you cool the 1st one? What type of heatsink can you use?

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

@twotone3070

6 жыл бұрын

The nerd version of Russian roulette.

@ethanf5961

6 жыл бұрын

Twotone more like Chinese roulette.

Do you think I can use one of these for a small indoor around a half square meter ??

One question: Could you pls give me the link for finding that big panel? Tried with the parameters you said on ebay with no luck.

It needs some kind of diffuser to spread the light a bit more, it would make a good general backlighting unit :-).

@punker4Real

5 жыл бұрын

you can get one from a Broken LCD screen

holly crap...that's big...i've never saw such a big cob...

Hey Clive... I don't see a link in the description. Just curious about this cob

Still useful as a camera ring light for glossy objects if the bench and light were offset 10degrees?

I dig it, 6mm hole right in the middle, I thought you were gonna mount it someplace. Boy I was way off.

@raymondmucklow3793

6 жыл бұрын

?

I can't wait for the inevitable goliath COB that is at least one square foot.

@blackirish781

6 жыл бұрын

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.

@TheAmpair

6 жыл бұрын

Real "Goliath COB" arrays are officially measured in Hectares ;-)

@johnfrancisdoe1563

6 жыл бұрын

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.

@TheAmpair

6 жыл бұрын

"Goliath COB arrays are controlled by inserting or removing graphite rods into the power supply, keeping supply output within

@pauljs75

6 жыл бұрын

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.

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?

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!!!

Can panels like these be bent in a convex shape without damage. I.e. wrapped around a coffee can cylinder?

I don't really have a use for one of these but is so want one!

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.

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!

@bigclivedotcom

6 жыл бұрын

The mains powered COBs often have the LED all in series anyway, so it's less critical.

Omg ... I have to buy some of these! ... :). Lighting for my mobility scooter! ... pimp my ride!

@Mr.T4LLY-0

6 жыл бұрын

Get a bigger battery else your 11 miles will be down to a 3 mile radius? Or fit a dynamo :)

@xavierayayaell546

6 жыл бұрын

They call that the Jaywick special.

@herauthon

6 жыл бұрын

put a windfarm on the bike - electrify while drive . . one fan for free

@Steve211Ucdhihifvshi

6 жыл бұрын

portable nuclear reactor would be the go. Im sure russia would sell one to you.

@purdy9431

6 жыл бұрын

Xaviera Yayaell , Are you talking about Jaywick Essex ?

Clive, when you said die LED, you reminded me of Goldfinger.

Clive, would it be possible to use some of those varible resistor ICs found in 240v LED modules to limit over voltages and then power theses things from a car?

@bigclivedotcom

6 жыл бұрын

They're not designed for such high currents. It would be better to use either a simple resistor to drop the small voltage difference, or a low drop regulator.

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.

Hello Clive! Wanted to know which camera app are you using. Cheers :)

@bigclivedotcom

6 жыл бұрын

Open camera.

"Made in CHNA" - Where?

@farx4070

6 жыл бұрын

I've seen products made in CHIN, This isn't the worst

@wildbill4680

6 жыл бұрын

😂👍👍👍

@generaldistrust

5 жыл бұрын

Short for CAHOONA?

@kraio-sfu

5 жыл бұрын

Council of Household Neutering Apparatuses

4 жыл бұрын

EVERYTHING is made in China!

This is interesting device. I want to know how bright with full power lighting.

What do you use to adjust the voltage? Ive got a 405nm laser id like to dial down to take a picture of.

@bigclivedotcom

4 жыл бұрын

The laser might require a minimum current to lase properly. I use a variable bench power supply.

what camera do you use that fits a 6mm hole and produces such a nice image?

@bigclivedotcom

6 жыл бұрын

A Moto G4 phone.

I have the 300watt cob led under test .9 months 24/7 on with 13 volt dc and still going

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

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.

I wish you would put where to buy link in your description ! But good videos!

i want to make a lightbox with a cutout logo in plywood infront of it. I want it to be very bright because i will have a color plexiglas 3mm between the glas and the cutout. which do you recommend? its a closed box 20x30cm and its closed so no aircooling 😁

That's big enough to melt my face! It's just ridiculous!

Thats nice.

are you able to measure the spectrum?

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.

these are soo cool. anybody has links with prices?

I wounder how big the range of one of those is, if it's enough to light a whole backyard or something. But inded a nice product.

for 200w cob led is the wire too small on these led panel?

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!

@bigclivedotcom

6 жыл бұрын

I think the polarising filter works best with distant point sources like the sun.

the cheat sheet actually defocused it it was focused perfectly already

Mount a clock module in the hole. Run it so it's glowing reasonably dimly.

When using this with clips on a car battery the resistor is usually in one of the battery clips.

LOL that hole you had drilled in that LED panel looked like there was some speck of dust on my screen.

I looked on eBay the largest I could find providing I typed the proper search was 70 W at 12V. Not as large as the one you have. What search criteria did you use.

@bigclivedotcom

6 жыл бұрын

Try 200W COB LED.

@bigclivedotcom

6 жыл бұрын

www.ebay.com/itm/253172058690

How do you wire these? I have one from China and had no manual and I see 3 sets of +/- pads..

@bigclivedotcom

4 жыл бұрын

They usually just have them all commoned for convenience of wiring.

Is it 200w equivalent ?

3:00 am ? That’s what says for me . When this was uploaded.

A interesting subject for a video would be lightning strike detectors they seem pretty interesting

what could you use this for?

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...

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.

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.

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.

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

I’m still waiting for the smaller one to turn up which i ordered when you did the last video

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?

@bigclivedotcom

6 жыл бұрын

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.

The future of room lighting?

Who sold this? I want to get one.

Hey man I'm looking to buy some leds to make a diy board and the information on the leds is just numbers and letters to me I really need to know what kind they are and if I can use them for a grow light

@peterrolfe528

3 жыл бұрын

My email is rolfetamworth@gmail.com can u please email me so that i can reply then that way we can chat and i van show you these leds and cobs this bloke bort a heap but has no idea what's what or how to read the codes or anything.

Is it me or is the very distinct patterns is the Grim Reaper or something similar like a walk sign sideways

What about running it from a semi truck at 14.5 Volts???

I need walls and ceilings like this.

@prakharmishra3000

3 жыл бұрын

To die of mental strain from all the light

A 3X3 Matrix with 8 of those panels, would also make a nice ring light ;)

Wtf this is beast

Have you seen the 60cm long CoB strips on aliexpress?

@bigclivedotcom

6 жыл бұрын

I'd be too worried about getting one of those through the post intact. Most long objects shipped here end up bent and buckled.

16.66A at 12v to get 200w, that is an insane amount of juice for LEDs in general lol

watching this on an HDR monitor makes me want some goggles myself

Clive, I'm building a photo booth and I'm wondering if you could test the following. What is the time from 0 to 200 Watt startup time and how hot does it get when it's on for 4 seconds without heatsink. Also is there a difference in startup time with DC cobleds and the 220v AC versions?

@ZillionPrey

6 жыл бұрын

Kenneth Tan LEDs Turn on instantly

@KennethTanFotografie

6 жыл бұрын

And what about the heat ramp up @ 4 seconds ON? (@ 200W)

@bigclivedotcom

6 жыл бұрын

It would be fine for bursts of output, but I'm not sure I'd use it in a long term professional product.

@KennethTanFotografie

6 жыл бұрын

Just had a look at your 50W driverless COB teardown. I need to build it from a CC driven COB led to eliminate flicker. I'm guessing for the brief time it's on, temperature will not be an issue. Thanks for the best electronics chanel on youtube Clive!

@KennethTanFotografie

6 жыл бұрын

Where to get a 100-200 Watt constant current driver that has pwm support? For 12V COB leds..

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.

@farx4070

6 жыл бұрын

No go the li-po high current route

@tyttuut

6 жыл бұрын

Music Central Even better!

@farx4070

6 жыл бұрын

The Tyttuutface yeah man around 48volts @ 50amperes would do that board real good, oh yeah, and did I mention smoke

@michaeltempsch5282

6 жыл бұрын

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 :-)

@timothybarney7257

6 жыл бұрын

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.

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

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.

@HVAC-BDE

6 жыл бұрын

stefantrethan same here... Shit takes like a month to arrive.

@stefantrethan

6 жыл бұрын

Yea but you can't complain about free shipping.

@july8xx

6 жыл бұрын

just sing "i'm going to get you on a slow boat from China".