The Department of Energy provides a helpful guide to knowing when it's useful to turn off the lights in your residence or office:
Supporters are now helping to
Most rooms are often vacant for an hour or more at time, but since we don't think to turn off the lights when we leave, more electricity is consumed to keep them on, than if we turned them off and back on again when we needed light. Let's change that and be more efficient with our energy consumption!
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