Rick from what every one else tells me my eletric bill is way less the most people with a tank this size. If my bill keeps getting higher my wife may make me get rid of it. I am very happy with it, I also have T5s on the tanks, as I didn't want part of the tank to be in the dark and part well lit. You can tell where the light is over the tank if you know to look for it but it is not obvious. One reason for it was to promote more natural growth of my corals. Your welcome to come see it some time.