Hello guys,
i build myself a growlight using the chinese "knockoff" QB288 boards with LM281B+ and epistar. Im in process of calculating the umol/J, for the samsung diodes that wasnt a problem, because its documented what rank they are. So i can just use the samsung calculator to get to the lumens/watt and convert that to umol/J.

For the "epistar 660nm" i cant find anything useful other than they are also 2835 formfactor. Does anybody have data on how much umol/J they produce? I also dont know if they use the same power, meaning, if they have the same resistance. If a board pulls 50watt boardpower, does that mean the epistar pull 50:(32/288) watt? because its 32 pcs on each QB288 board?