yea. i'd suggest putting the fan in position to where it will suck the hot air out. having an active intake and passive exhaust kind of swirls around the hot air. yes it cools, but you'll notice a temp decrease with powered exhaust. you can set up the fan similar to a cool tube set up with the hood you have since it already has tempered glass.

by the way. if your temps are 75-85 with the lights on already you are doing very good. i'd suggest just switching your fan to pull air OUT of your box instead of IN. then see if you need the fan. hope i helped. im kinda out of it.... you know:rastasmoke: