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lightshow

  1. Number Six

    When should you turn off lights...how long

    What I'm trying to ask is this: If a light is on in a room and you're leaving the room but coming back to it later, how long is it that you'll be out of the room before it's worth it to turn the light off to save energy? Should you leave it on if you're coming back in 30 seconds? 1 minute? 5...

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