My electric bill for 1800 sq ft house is 151.00 with 4 tanks, and 5 metal halide 250 watts, , two on 55 gallon, one over 29 gallon and on the main tank with Two 250-300 also. Ac at 72 degree. Lights on 10 hours a day. After cleaning and re oiling the blower dropped the bill from 250.00 to 150.00, that is crazy savings. Ohh and I change my air filter one a month. I'm glad I did it on my own when I first moved in, bc a bill that much is a killer on the pocket books in the summer.
-Joseph