Thanks bluzeman, I was wondering if anyone knew how close should i keep my light to the plants. I do not have a cooltube yet however i have a 10 inch oscillating fan on high blowing directly at it. Seems to be doing the trick as far as heat but one of girls is slightly yellowing and i know it can't be due to any other issues other than the lights? Basically how far do you guys keep your HPS systems. This is new for me and my 14 26w cfl's were doing awesome and then i decided to upgrade but i feel like my cfl's were doing more work? Let me know guys TIA