Hey all, I have been growing in the dealzer grow box for a few weeks and see it's not going to be big enough to provide anything worthwhile. Check out my grow here,,, http://forum.grasscity.com/hydroponic-grow-journals/1202834-1st-time-hydro-grow-journal.html I have a second box built already, but would like some assistance on cooling and lighting. The new box dimensions are 18"X24"x48". I want to put this light in there ... iPower Grow Light 400W HPS Dimmable Basic Wing Reflector Set - 400 Watt Grow Light Sets - iPower Grow Light Systems with the ballast set down to about 200W, that way if I expand later I'll have the 400W capability. Can I feasably keep this space cool with a 200W HPS, and if so, how many CFM's do I have to look at exhausting? I looked at doing fluorescents but for about $100 this HPS puts out up to 55,000 lumens. $100 of fluoros looks like it can only offer 10-12000 lumens. Thanks for the assistance. Oh, and I plan on lining the inside with mylar so don't let that black paint throw you off, just wanted to clean it up a little bit.