lighting question.
 

Ron, New grower here, lighting question. I am going to be using the 11 plant system, basically 4 1/2' x 4 1/2' enclosure-topless for the lighting. i have 1- 150w hps light and 2-400w MH lights. Do I need this much lighting?-will it help my yield if I use it all? I want as much product as possible from my plants. Does the amount of light add to yield? Basically- are the two MH better than using just one of them? And these are the types of MH lights used in factories and industry. Since I am leaving it "topless" should I also use a fan? It will be in a basement where it can get pretty cold if the temp. gets low. How much light, what about the heat? Please help. phil.

That is a lot of light for that space but you can't have to much light especially when compared to the sun. If you had a two arm mover then I would use the HPS and 1 MH. You want to mimic outdoors as much as you can when you try to grow indoors. That means temperature around 75 - 80 degrees and add a fan for the wind because it helps to strengthen the plant stems.