Well I have a closet grow. About 4ft wide 8ft long 10ft high. Currently I'm a cfl grower w/ good success. I was curious about going hps. I wad looking up shit on it but I'm confused LOL I am thinking of buying a 600-750watt ballast and the bulb. Now if I'm correct that's all I need? Or is it more. I have fans,ventilation, and space.