I got about 5.3 sf to work with, 19.5" deep, 39.5" wide, and 8 ' tall. I plan on getting a 250 watt hps, that would be more than 5000 lumins a sf. Well the first question I have is how much heat does a 250 put out, I'm going to try to either get a cooltube or a easycool 6 reflector, but still...