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    Water cooling surface area requirements

    Hi guys! I've seen passive and air cooled surface area requirements but what about water cooling? If i have a water cooling system that can handle 25 celsius (80F) consistenly, how large should the heatsink be or is it irrelevant because of surrounding ambient temperature?
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    Price suggestion for premade cob kit in Europe.

    Hi guys! Im going to sell citizen cob kits for extra cash. What price range do you suggest for the following kit? 4x CLU048-1212 3500k 80-90 cri 4x CLU048 holders 1x Meanwell HLG-185-C1400A 2x 24 inches aluminium angle 4x Pre drilled passive pin fin heatsink + wires and outlet
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    Spectrum for veg, 5000k 80cri or 4000k 90 cri

    Hi guys! Which spectrum is better for veg? I can get the 5000k 80 cri CLU046-1212 with 147lm/w or 4000k 90 cri clu046-1212 with only 117lm/w. Is it better to loose a bit on the red spectrum for extra efficiency or get higher cri with more red. I belive 5000k has more photons but not sure...
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