I would try to create an enviroment where 50 watts p.s.f. in available to your plants. Even better if you are aware of your light's lumen output try to get 6000-9000 lumens (for growth as little as 3000 will do but let's keep em' happy!) p.s.f. . If you are unaware of your bulb's lumen output maybe check online, like at www.1000bulbs.com and take it from there..... Also, it sounds like you should be running metal halides at this stage (veggie?) but if you don't know that by now then I doubt any of this made sense..... Good luck man, and keep eveyone updated on your progress..................