These are the dimensions of my closet:
3.2 ft wide x 6 ft long x 8 ft tall about 150 Cubic ft.
My previous setup included a 400W switchable ballast with a diamond style reflector. I had a lousy 75 CFM fan hooked up, but it was during winter so the temps didnt get that high. The temps rose to about 10 - 15 degrees with the lights on, making the temps between 75 - 88.
My new setup includes the same 400W switchable ballast, but with a cool tube. I also have a fan that is 400 CFM that pulls all that heat through some insulated 6 inch ducting to the attic where its hooked up to a vent to go outside. Odor management will be implemented later on.
Yea I know that I have a lot of "bends" in my ducting, but that hole was already there because of an exhaust fan I had. The airflow is amazing, and it only raises the temp between 1 - 5 degrees compared to 10 - 15 degrees! I can place my hand up to the cool tube and it just feels like a CFL. I also like this closet because in case of anything that happens, I can take everything down in less than an hour and it will looks like a standard closet