lets see....2 65w cfls @ 3900 L, 9 23w daylights @ 1600 L = 22,200 its bright as fck. my room is 4'x4'x6' I am only using 2'x3'x4' @ the time everything is hooded, 2 lights per plant, @ 4" and I have mylar, and white 1/4 " styrafoam sheets around everthing.