those 2 feet are gonna help like crazy. you wnat your temp at like 80 degrees. don't go over that, i try to stay betwen 76 and 80. that 90 stuff turtle dude is talking about is crazy hot. and it might be good if you are sucking air out of the box over the light and out into the room. this will help get fresh air into youre box, and that is good for your plants.