I don't know where you keep getting this 1000 watt cfl stuff, I don't have 1000 watts. And no, I don't have ventilation, my cabinet is sealed, and climate controlled. I converted a deep freeze, using the cooling system to climate control with a thermostat connected to the power. IE. the freezer is not plugged into the wall, it's plugged into the thermostat, which turns it on and cuts it off at the desired temps.
Now, I suppose you are going to say something to the effect of "if you have cooling, why not use an HPS?" 2 reasons, #1 I don't have the vertical space, this is the biggest reason. The unit is divided into two compartments, a flower chamber and a veg chamber. #2, I experimented with HPS and the heat is so extreme that the freezer ran almost constantly. It would run and run, shut off, and 10 min later run run again. Just not what I wanted, to have the cooling system running constantly.
GS