ditch the incandescents as soon as you get other lights to replace them. they are no good for growing. figure out the lumens you have and what you will need. cfl lights can be as close as an inch to your plants, but make sure they never touch or they will burn. basically, you should have a bare minimum of 2000 lumens per plant, but the more the better. the plants will love it. cfl's work well for beginners if done right. hps is great to have, but can be an investment.