My plants are already flowering under 600w of CFL's. Dont ask me how I somehow ended up with this many CFL's, but I did. Perhaps at some point i should have stopped to get a more economical and more effective 400w HPS, but I didnt and Im halfway through flowering and wishing I had more light. I mean, dont get me wrong... my plants look great, but I can tell theyd like a bit more light. I think im jus going to say fuck it, and do this whole grow with CFL's. Ill get an HPS when im at a better time... financially.