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definitely the Folux boards. they are WAY more efficient with the LED being around 190+lm/w and the board efficacy being ~170lm/w. compare that to my old Citizen CLU048-1212 4000K cobs (ran @ 33w ea) which were around 130 lm/w. Not only that but the Folux boards cover more area! I'm also working with other surface mount monocolor LED to enhance the spectrum as I see fit.Â