I just got my 315 a week ago and must expand my grow space for more height before I can start using it but got no growing info with light and can't find answers online. Got a couple of questions for folks that have been using 315's. With seedings and early veg, do you turn down the ballast power and how far from seedlings do you keep lights? I have been using CFL's so light burn has never been a concern before but now...