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This one? http://timbergrowlights.com/300-watt-cree-cxb3590-6-cob-grow-light-kit/#product-details

Yeah i figured i could go for something like that, the real question is what lm/W i'll be getting from that setup, i mean i know from their datasheet what lm/W to expect at nominal current, but how do i calculate the efficiency when i under/over drive them? and how would this setup compare to...

Hello everyone, i need some help because i've been reading nonstop for the past week and the more i read the more confused i get, i'm aiming for a 4 cob light at around 200-250w total, i want 3500k 90 CRI cobs and obviously the best lm/W i can get. Do i go with 4 Citizen 1812 3500k 90 CRI @...

That falls in line with my thinking, basically exchanged some far reds that weren't getting measured by the PAR meter for some extra blue/green spectra, makes sense that gen 6 reads higher PAR, on that same note, if the spectrum of gen 6 3500k is really more green/blue heavy with less red then...

Very interesting, just by eyeballing the spectrum graphs it looks like the gen 6's have more blues & greens in exchanges for some reds, you can clearly see that the cyan valley isnt as deep as in the gen 5 graph, for the 3500k the cyan/480nm bottoms out at 32% for gen 6 vs 22% for gen 5 and in...

Sorry should have specified, i'm looking for the 5th gen ones since the 6th gen have a different spectrum, 5th gen peak at 630nm while the 6gen peak at 620nm and look like they have more green, am i wrong about this? Btw, anyone tried a build with their 97 CRI 4000k cob? that spectrum...

Guys help i've been trying to find somewhere to buy a few citizen cobs for the past week and the only place i seem to find is fucking digikey, and they are so damn expensive, i'm looking for 3500k 90 cri cobs and they seem to be out of stock on both cobkits and northengrowlights..

Hey man i've been growing lettuce kratky method with the 4-18-38/calcium nitrate/magnesium sulfate mix in full sun for years with incredible results, my tap water EC is around 0.45 and i mix 12g/12g/6g per 5 gallons of tap water, my tap water has a ph of 7.5 and the fertilizers drop it to about...