Cool you popped on the SP. I first started with the recommended distance in the user manual when I had my SP's in the flower room. When I put one of the SP's in my 5x5 grow tent I had it really high (3 foot over the top of the plants) and it worked well. I adjusted the dimmer to 50% when the plants were young and then cranked it higher as they grew. In flower I turned the dimmer to max 100%. When I hooked up the hook supports for the cables I moved the hangers all the way to the outside ends of the light. It may be better to move them in a few inches from the ends for better support. The light frames are aluminum and in retrospect moving them in may help the lights from bowing just a thought. I do get great plant growth with the SP's compared to HPS or MH.