Okay so im working with a pretty nice setup, well alot better then my last setup of only 2 cfl's this time I have a 400 hps, 7 fl tubes and, 1 cfl working on getting 3 more soon. I have a fan blowing on about 12 different plants. I leave my lights 18-6. They are from around 1 1/2 - 2 1/2 months...