Household rules vary quite a bit from home to home, but there's one that most of us grew up hearing over and over again: "Turn off the lights when you leave the room!" If you had parents who were at all concerned with conserving energy, or more likely, lowering the number on their energy bills, then you probably heard them frequently repeat this rule—and maybe even scold you when you left your bedroom light on. However, times change, technology improves, and the rules that applied back then don't always apply today. With modern intel from the Department of Energy, we're rethinking everything we thought we knew about leaving the lights on and "wasting energy." Here's what you need to know and how much you really need to worry about turning off the lights.

Should You Turn the Lights Off Whe

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