I am starting a u-haul grow myself as we speak. I have 12 42w cfls 8 65k 4 27k at top and about 6 42w cfls for side lighting when I need them. I will see how the box works for me(first time using a box). The last grow I had I didn't use any walls just lights around my plants and got an oz off every plant. Cfls have always been good lights for me, I don't understand why so many growers can't figure them out..they are so easy to use..just turn them on and grow!!!