Power off your monitor while not in use.
CFL's everywhere.
Don't use electric cooking appliances(toaster ovens, ovens, MicWave).
I took the lights off my aquarium, Moved it in front a window.
I suddenly find myself reading more(not watching TV).
WeatherStrip every window/door.
Add more insulation.
As said before, LightCycle accuracy(12/12(F)-16/8(V))
Do not be fooled by claims that 24/0 Cycles improve growth.

Hope this helps.(MyBill $180/Mo)