Oh, and to anyone reading this thread and thinking about getting LED's in the hopes that it will reduce electricity costs. Don't use that as a factor. My electricity bill did not go down at all. I was running 2x250 MH and 4X96 power compacts and moonlights. I did not run a heater on the tank when I had halides, since I did not need to. I now run a heater on the tank plus the 2 LED modules and I need a third module. However, the LED's will save me money over the years since I don't need to buy bulbs.