Yes, I was thinking about getting a 70 watt HPS, i was looking at your log, how much does it really put out, I understand that you can go up to 150 in small cabs, but I just don't want to trap all the heat in, will 2 120 mm fans work at the top for exhaust, with 2 80 mm fans at the bottom for intake (I really need to step up on ventilation :-D)