Maybe this will help...I think this calibuddz dude is on 5 weeks flowering here, I think they look damn good for pure LED light and he is growing in soil so with a hydro set-up it would likely be much bigger at this point. (and these plants look great for 5 weeks in soil) The 660 nm peak red with the white LED's does the trick it seems. :stoned::stoned::stoned::stoned::stoned::stoned:

LumiGrow ES 330w LED Test - Page 15 - Marijuana Growing