First pic: Front bottom (intake).

Okay, here comes the help I need:
I'm currently using two 42 watt 2600 lumen cfls (2nd pic). I was using three, but I couldnt keep the heat below 80 degrees. When I'm at home, and I can open the box and let it cool better, I plug in another light. It is a 25 watt 1470 lumen cfl (3rd pic). I figure the plant wouldnt mind the shift in how much light it's getting? Clouds do it in nature? My main question is if the two 42 watt cfls are enough for one plant or not, and could it hurt to add the third light every now and again?