I have not been on rollitup since '07, but I am doing so to inform anyone reading this. Do not waste your money on an LED system. I just finished a first grow with a 120 Watt tri-band, state of the art, LED grow light, purchased from a reputable company. It really is well made and I'm sure will last forever, but don't bother. I spent $300 on it, and changed out my 400W HPS in the middle of veg. At first everything looked great. The leaves were beutiful green during the end of veg. When I went to flower, the buds started OK and looked great, but then nothing. No Yeild. Zippo, Nada... Maybe 1 oz compared to 5 or 6oz with HPS in my particluar set-up Please take my advise. I am now changing back to my 400W HPS. I really wanted to believe in this technology for the reasons well advertized, i.e., less power, cooler, no identifiable radiation signature... Based on what I learned I would use only for veg, but I'm not convinced it would be any better than cfls.