3,000 lumens per square foot is minimum with adequate growth, 5,000 is better.
I'll let you do the math
achilles Reviewed by achilles on . How many lumens......? I have a 2'x4'x5' Grow Hut, 40cuft. How many lumens would I need to be optimal for flower? I have currently a 90w TriBand UFO, a 2tube Shoplight w/Nat.Sunshine Bulbs and a 68w CFL(2700k;10,000 Lumens). Curious to have this 1 answered. Thanks in advance :thumbsup: :thumbsup: Rating: 5