I don't know to much about the point in which lighting starts to deminish,but I would say yes.Just look it like you will get a real good yield.You should aim for 30-35watts a square ft.
OHIOGOTPURPLEKUSH Reviewed by OHIOGOTPURPLEKUSH on . is 200w psf & 29,000 lumens psf too much light? lets say you were to take a single plant and tie it to a panel of chicken wire that is 2x2-(4 sqf) to where the plant is growing vertically with all the branches spread out over the entire 4sqf, trellis style-basically flat -2 dimensional. now if you hang 2, 400w lights vertically, one on each side, that would give you- 100w per sqf & 58,000 lumens from each light. divided by 4sqf is 14,500 lumens per square foot! Rating: 5