or a 250w hps. if thats not possible you can make due with that(except you should get 1 red spectrum and 1 blue spectrum). I'd get a 400w or 250w hps myself, they are actually easier to control temps w/ a remote ballast(which generates alot of the hps heat) you can keep outside the grow box/area and a cool tube on the bulb can take care of the rest. I'm using 2 400w in a 44 inch tall area and temps are not a problem.you will have to invest 2-3 hundred bucks, but it will be well worth it.