Contact surface of a heatsink for a LED COB

Thread Starter

jobee

Joined Mar 10, 2023
21
Hey folfs !
I am looking to cool a COB LED. This is a "bicolor" COB (kelvins may vary). See attached file. The COB is composed of a 200w warm white and a 200w cold white. I would like to use these 2 colors up to 150 w each. A total of 300w. I beleived the LED is for a total of 200w, but the seller said me it 200w for each color.
My problem is that the LED is large (diameter 58mm), too large for a CPU heatsink (whose cooling surface may be a square of 40mmx40mm). I wonder if by installing the LED on a heatsink of this type, the edges of the LED which will not be in contact with the heatsink will overheat. If so, I wonder what trick to find. Can I attach a larger copper plate to the heatsink to attach the LED or will this be counterproductive?
 

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panic mode

Joined Oct 10, 2011
2,807
image shows that 58mm is just the lens diameter, product diameter is 68mm.
i would use copper plate and braze copper coil to it, then use liquid cooling.
 

Thread Starter

jobee

Joined Mar 10, 2023
21
Wow, thanks a lot for this answer!
Actually heatsink designed for high power LEDs like you linked me are available on website with a huge minimum order. I can't find for 1 or 2 units on Aliexpress for exemple. I think I will do your idea with copper coil. Thanks a lot!
 
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