Recently while visiting a relative I noticed that at night she'd switch on all lights in The House and leave some on till morning. That's probably one of the best ways to get yourself a huge energy bill. Why waste energy thusly? In my home, I normally have only the light I'm using on. If I'm in the kitchen, only the light bulb in the kitchen will be on. When I'm in the living room I might not have the lights on at all since all I ever do there is watch movies. Saves me a lot of money. Question: how many lights do you have on in your home at any given time? Only the ones you are using? All of them?