The US Department of Energy gives us some guidelines on when to turn off those lights. If you are using regular incandescent bulbs, it's always best to shut the light off when you aren't in the room or using it.

However, with fluorescent lighting, you'll need to estimate when you'll need the light again. Switching these types of bulbs on and off every minute will actually make them less efficient. However, if you won't be using the light within the next 15 minutes, it's best to shut it off.

The easiest way to switch off lights is to plug them into an outlet that is controlled by a switch. Easy off, easy on. And the biggest way you can make an impact? Teach your kids to shut those lights (and TV) off when they are not in the room.

We love what Energy Hawk has to say, "Your father was right, you don't own the electric company so TURN THE LIGHTS OFF." And of course, we recommend the switch to CFL (compact fluorescent light) bulbs whenever possible.

Rebecca says: I grew up in a very well lit house. At night, all of the lights were on in every room. However, after moving in with my husband I quickly learned to just have lights on in one room at a time! It takes some serious getting used to, but it's worth it.

When to Turn Off Your Lights: US Dept of Energy