u gotta figure out how much u smoke...then figure out how much you'll need for like 120 days/4 months. this amount of weed is what youll wanna be able to produce. that way your not out any $ all year, and ur as high as u wanna be. I know that i couldnt produce enought bud on ur set up to fufill my habits. but some peoples just smoke a lil here and there, and then you'd be good with a stealth cfl box. HPS ur gonna have to think about more serious vents....plus check to see wut the bulb, runs off of (lowes 400w bulb), like it needs a cord set, and a ballast most likely. and i dont advise building a ballast, unless ur expert. might be better ordering a total package from a internet hydro retailer, and getting an air cooled hood, ballast, and bulb.