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If my calculations are correct, it'll be 56.34% efficient so 21 heat watts per cob I think. I'm using Mean well HLG-185H-1400B driver to run 3 or 4 cobs.

Hi, I'm doing a build, have watched growmau5's videos and calculated a suitable heatsink. Would someone confirm that this heatsink is suitable for two 36V cxb3590s? Active cooled with 1 or 2 120mm computer fans. edit: It has 2306 square centimeters of area