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?
DrewPD Reviewed by DrewPD on . CFL heat question 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 Rating: 5