I have a closet I am changing into a grow room. The space is 3.5' X 7.25' X 8' high. Just over 25 S.F. If I use 1 1,000 watt HPS light I will have just over 5,500 lumans per S.F. If I use 2 600 watt HPS I will have just over 6,800 lumans per square foot.
Easier to hook up 1 light than 2...