one other thing i forgot to mention,if you do go with 1 fan,that has a y splitter that is connected to your lights and the other portion going to a scrubber and out the exhaust, get a piece of foil tape and put it 1/4 of the way blocking the the exhaust,do this only on the lamp to divert more suction on the filter" lights dont need a great deal of cfm to cool them effectively,and the rooms exhaust is way more important.