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Thank you!! And sorry to supra - i found the chart as the second attachment to you post. Where did you source cobs? Digikey?

@qwerkus thanks for the installation instructions for the drilling:) does the first screw make threads for the second one? have a nice day folks

@SupraSPL i originally wanted 4x cxb 3590 36V run at 1.4A (iirc that's most efficient)? However, this single light will be used for all stage of plant life. The lack of color temp. availables steered me to cxa. How important is color temp? Now I see to run cxa at .2 amp would cost a lot up...

Can I put 3 cxa3590 77V (run at 1A?) on your 4.9", 3" baseplate heatsink? How many fans that you mentioned do you recommend for such a setup? I can't find your spreadsheet on cob vs driver with respect to varying currents and their resultant efficiency. I just need 3 cobs, a heatsink, the...