I cant seem to make up my mind. 600w or 1000w for a 3' 8" by 4' 10" with 8' of ceiling height. 6 ladies would be the max. I dont think cooling will be an issue as this will be a vented hood plus its in a naturally cooler area (basement). My thought was I'm looking at getting a dimmable hps/mh ballast so I might as well get the 1000w right? I could always dial it down to 75% = 750w. I'm pretty much convinced on the 1000w but something is telling me thats a little too much for that space.