The 400 is a great choice but like it was said just use a good inline fan to move the hot air out. Make sure your hood has a glass heat shield too. Your yield will improve by a lot if you do. You can get your light closer and that will increase your yield.
Zandor Reviewed by Zandor on . yet another question about lights If someone were thinking of growing in a small 3'X3' area would a switchable 400W MH and 400W HPS light be a good place to start? Would smaller 250W size systems be better for that size of an area. Would it make a difference on the power bill as well? Rating: 5