Quote Originally Posted by physicsnole
by this do you mean the wavelengths plants need for photosynthesis?
Kinda, they are from bin containers and from the research ive seen others do, they could vary 20nm(or more) either way. not exactly what I think you're looking for.

Please visit GREENPINELANE.COM (DONT MENTION MJ) to see some experiments done there. they haven't used those exact panels but 5mm and has stepped up to the class 2s. seems to be doing better with them

not to mention that the one i got had broken wiring in the back. 1/3 panel didnt work till i took it apart and fixed it. now thats quality:thumbsup: