mauricem00
Well-Known Member
the number come from the cree data sheet for a 3070 bin Z2 at 1400ma at 50C. they claim 6208 lumens. times 4 diode and divided by 4 1/2 sq ft grow area. I have not tested diodes from that bin but assume that the data from cree is accurate. I did test radiometric efficiency on a CD bin diode using a standard thermal test and the results agreed with the data from cree.How did you arrive at that number?