MATTYMATT726
Well-Known Member
4x4? Yeah, I'd want 560. 35 watts top tier led per sq ft. That's why HLG says 1 x 135 watt QB is 2x2. 135 x 4 is 540 watts. Older HPS users go by 50 watts per sq ft and CFLs say 100 watts to be adequate enough per sq ft.