Thought I might add this. This was my first grow room setup. I built it to flower my first plant. It is big enough to flower 2-3 plants if you use LST to control height. This is made from a wardrobe box from U-Haul. The box is very sturdy and you can mount the light fixtures through the cardboard. The lights in the box are used until the plants reach the bulbs, then you should switch to just the lights in the cover so you don't burn the leaf tips. (Learned the hard way). PC Fan mounted on lid to draw heat away from plant. Box is painted with KILZ. Tried aluminum foil but it created hotspots.