I agree shovel. I use 1KW for vegging and used to use them for flowering too but had more area to cover so I went with 3 400's and am having excellent results! Nice large and dense flowers covered with trichomes...I see no difference with this harvest compared with many 1KW harvests from the past. But for a cabinet I'm afraid I'd have to suggest this person use nothing larger than a 250 with supplimental lighting from a couple banks of flouro's in the top corners of the cab to create a half hexagon effect (if you can picture it...or picture a box with the top edges rounded off using a bank of 2 tubes on each side, long enough to fill the length of the interior edge). I would also recommend you get one with a remote ballast. You're going to have enough battles with the heat, especially once the heat of summer arrives and a remote ballast will help distribute it better than one that is attached to the bulb/reflector.