40V 48A 120,000 lumen Yuji COB in 95CRI

Flashlight Modding and DIY Parts
1

https://store.yujiintl.com/collections/frontpage/products/yujileds-bc-series-high-cri-cob-led-900h-1500w-pack-1pcs?utm_source=SUBSCRIBERS&utm_campaign=b56d5b31e0-EMAIL_CAMPAIGN_2018_06_11_06_02_COPY_01&utm_medium=email&utm_term=0_c593e2bf9c-b56d5b31e0-81006433&mc_cid=b56d5b31e0&mc_eid=a00cf254ff

…. and 1350 dollar. Something for a nice flood light.

2

I have two of those.

Sorry, I just checked and they were sunny side up fried eggs. :open_mouth:

3

Hahahah. too funny :D

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But on a serious note.. How do you power these? 40V 48A?

5

Well, then this is the new most powerful COB LED on the market!

You won’t get sharp shadows with such a large LED…

6

That price is outrageous. It would be awesome to play with.

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OMG it’s the Mother of All COB’s! :person_facepalming:

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Wow 1920watts what kind of heat sinking would you need? That would be one mean active cooling setup.

9

1500W on that small surface pretty much calles for water cooling
on the other end likely a block of 4 or 6 140mm fans with a decent radiator

their 500W was likely the last you can air cool, and this one is so small a reflector can be used

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It’s still a relatively small light source unless the target is 10cm away.

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I don’t even think you can get a water cooler and radiator buff enough to manage 1500 watts of heat, at least not smaller ones meant for computers. This is some industrial level stuff right here.

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there are water cooling radiators of 3x140mm fan that can cool about 1000W, of course thats not possible with silent fans
3 of those should be enought to cool 2000W, but then you got to use pretty noisy fans

13

I’ve seen that one in action. It’s $500 and needs at least 1200W (like a PC power supply or two smaller like server power suppliers in series) to run…fV is like 36V and max current is 12-13A on that air cooler. I think it’s used for photography and for hydroponics because it’s got such a high CRI and color reproduction.

I think water cooling is mandatory, or a very large heatsink with server fans.

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That’s like running a toaster over or clothes iron on max… but maybe if we use an MS18 as a host… :person_facepalming:

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Cool… So how far can we overdrive it? :smiling_imp:

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wasnt that quite simple to calculate

1/price*destroy willingness factor*100%

destroy willingness factor is usually around 5-10

so 1/1500*5*100=0.33%

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I’m guessing those specs are with it overdriven since it is only 60lm/w

I would be curious to know what sort of output it produces at 1000w.

A single Bridgelux Vero29 (BXRC-40A10K1-C-73 4000k 93CRI) will do 29k lumens at 255w. So, if you had 8 of them, for ~2000w, that would be 232k lumens.

Granted, this is assuming that you are water cooling them to hold them at 25C. At 85C you’ll only get 24k lumens but that is still just shy of 200k lumens.

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Yuji LEDs are very inefficient compared to other COB LEDs. They only make sense if you absolutely need the highest light quality (maybe film lighting).

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I’m pretty sure that’s the use for it, to get an artificial sun. That makes e.g. CGI-heavy movies way more realistic, for a relatively small investment.

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the yuji COB produced a lot more long wavelenght red to get R9 over 90 so thats of course one reason they are more inefficient than other LED types