Right now i have a 150w hps and one jack widow under it. Well if you look at my journal my jack widow out grew my hps about 2 weeks ago. So thinking for my next grow I want try the capn grow style. I wanna get a 600w hps and 3.5 ft by 3.5 ft by 6 ft grow tent. I wondering is it possible to run a 600w hps in that area without out a cool-tube or hood, like just a reflector. I was planning to have a regular fan running into the tent so the tent would be open and the fan outside blowing air into the tent. Would this cause temp. to go to high? Right now my 150 hps is running at 70-79f degrees. I just want to know what to expect.