Tim Fox
Well-Known Member
Sunlight in the middle of summer is 10,000 lumen per square foot many indoor growers shoot for as many lumens as they can get, 20,000 cfl lumens is really rock in it in a small grow cab, a 400 watt my/HP's is around 36,000 lumens, your grow looks really good
Size of grow room? lumen formula L x W = then x's answer by 2,000 -- this will give you the proper/correct amount of lumens needed for your grow space.