i find that they are best used to root or grow seeds to a point. i think that plants will only use the light/spectrum/intensity (what ever it is) for up to a certain period of time, like a matter of a couple weeks. so to keep full potentiel, at some point from one to three weeks you will want to give them the light the can use to grow, at full potential.i think as the plant matures, it will need different lighting, not just hps MH or kelvins, but like a different intensity or spectrum that floros cant give after 3 weeks or so. i use one for my clones and seedlings, but i have a 250MH and a 400MH soooo.