I agree that you should get mylar and replace the foil with it. I would not use any HID lighting because it would get the box way too hot. I would go with CFLs. I bought 42 watt 150 watt equivelant CFLs at walmart for about $9 a bulb. If you could get 2-4 of those bulbs in there you would have all the light you would need, especially with the reflecting mylar on the sides. Just get something on top to reflect the rest of the light downward and you will be set. Good luck..