Hmm my bill is about $225 a month with 4 600 watt lights. I run them mostly at night. I have changed all bulbs in the house to 23 watt cfls or 13 watt leds. In summer I have to keep my ac at 69-70 unless outside temps are 73 or lower.I keep lights off except when needed. Home computers can use few hundred watts so unplug when not in use not just turned off as they still vampire electricity. Same with stereos, dvd players,put fridge on energy saver mode make sure its a newer one old ones use huge power...use blackout curtains to keep out sun heat or winter cold.I use dimmable ballst so in flower I go 18-6 dimmed to 360 watts each 600 watt for flower..Tvs more then 3-4 years old such power plasmas use almst 300 watts..If your unlucky and have electric dryer and water heater do bigger loads, wrap water heater with insulation blankets to cut heating times.Keep looking around you ll find ways to balance.