I just built a 4' x 4'x x 4' grow box and wanted to get some suggestions on lighting. I was going to just build something like this- then stick in a 30K Spiral cfl, one 41K Spiral and one 50K Tube style cfl bulb. What do you guys think? I was told not to use a MH or HPS because of the heat in this grow box. I have intake/exhauist and ac but I just wanted to stay away from that issue.