Ok so I jusy got a 150w hps system, ballast, hood, exc. I need to know how far away should the light be from the plant? My exhast takes air right off the side of the hood so I am not to worried about heat. So can I put the light closer as long as the temps stay down?
Put the light as close as you can get it without physically burning the plants. I run a 400w as close as 6 inches sometimes if it's cool enough in there. Ignore the above poster. He is wrong.