well thanks both of you, but harddon, what if i had the floros and the hps on?? anyway my lights are called "natural sunshine" or something so im guessing they're not regular floros. I've seen as many as 50 clones under 4 46" tubes and they were perfectly healthy, I will only be planting 12 under 4 36". I'm pretty sure I'll be alright, I'll be sure to update you all along the way