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Those LED's are a good 4 feet above the plants easily, so why do they LED manufacturers post the PPFD 6 inched above a plants?
I don't know...I run mine much higher than recommended...
6 inches is extreme but 4 feet would a lot extreme in opposite direction. I think I still have a lot to learn about LED's, but penetration and bud hardening are no longer a concern.
Run mine on the low side 18 to 20
That's crazy straight perlite
Beautiful garden by the way chubby
Yes it is