run your lights ABOVE the plants ... 'fill-in' lights may be added later, if you wish, but results vary ... Fact: I was up to sixteen 40-watt tubes, when I finally gave in, and switched to high-pressure lamps ... and, I never looked back ... there is just NO comparison ... you can grow healthy plants with fluorescents, but you cannot grow the big, dense buds, that you desire, without making the switch to HPS ... :smokin: