I can tell you that those lights will be fine, as I have a 200 watt CFL, and you probably already know this, but those puppies put off a lot of heat, so make sure the space right under the light and above the plants doesn't get too hot. Make sure you're using refelectors properly. I belive that you can have quite a lot of plants in there, as long as you flower early, and I think that your yield won't increase but you will be able to harvest in half the time, like you are thinking, but make sure that you get a strain that finishes quickly and can handle SOG well.
phytokind Reviewed by phytokind on . new SOG grow questions. I've decieded to start a SOG grow. I'm going to use my existing cab (2.5''x1.5') as the mother/clone area and have allocated a space 2'x3' (6 square feet) for the flowering. Lighting will come for 2x200w CFL (envirolite) providing about 26,000 lumens. So that's 4,300 per sq ft. so, here's my Qs... 1.) Is that enough lumens per sq foot? Rating: 5