I've lined the walls and floor, and lightproofed. I've also installed a locking knob. I'll be putting in a 12'x12' passive intake (darkroom vent) down low on the door. Also, I was thinking of pulling air through a charcoal filter, pushing it through the light, and then out of the closet through a vent at the top of the door. I won't be using co2 so I'll probably just run the fan 24/7 for now. Is 600w hps in a cool tube or nice a/c hood with a 400+ cfm fan going to be too hot, or should I just stick with 400 or 430w? Does anyone have any comments or questions, or see any potential problems? I also need to know what joule rating is good for my surge protector for this type of setup. Thanks again for all the info.:stoned: