I have been running 3 250 watt MH for several years with great SPS success. About a year ago I replaced the center MH with 1 Radion. Initially I was dissapointed as we had some burning and low PE, but as the corals acclimated and I was able to get the settings right the varying light sources in my tank didn't seem to make as much of a difference. The TIR lenses were definitely an improvement. I will say that I have been a little dissapointed with some ongoing software and hardware issue with the lights, for the cost seems like they would have provided a fan that works for more than 6 months.