Quote Originally Posted by DrewPD
Hi all. I'm working out the details for a rubbermaid grow setup that is going to be 7.39 sq. feet. It's going to have 2 passive intake holes about 1 1/2 inches wide on one side, and 2 computer fans hooked up on the other side for active exhaust. I want to put 8 40 watt CFL's in it for a total of 21200 lumens.

My question is, am I going to have a major heat problem with this much lighting and this small of an exhaust? I don't want it to get over 85 degrees and I would prefer not to burn down my house. The room I will have it in is going to be pretty cool during winter - around 55-60 degrees F. If I am going to have a problem, should I go with fewer lights or a better exhaust?
dunno.... my cab is a 6 ft triangle thats 8ft high, has 10 23watt CFLs and and 10 4ft 2 tube T-12 flouro fixtures in it. the room temp runs between 70 and 75, the tops of the plant run around 80. The top of the cab is open and I have a 16 inch box fan blowing in from the bottom of the cab. I have been getting great results.