Hi,
Setup:
250w HPS
3'x3'x5' grow closet (black outside/mylar inside)
Exhaust fan w/carbon scrubber (forgot the CFM, but its more than enough)
White widow, auora indica, blackjack (1 of each)
All of this is in a closet that's 3'Wx 6'Lx 8'H and can be closed off by a door.
I've gone thru a few...