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The general answer to this general question is that a lamp lights up when plugged in and turned on. Incandescent lamps and fluorescent tubes emit light when they're powered up - just as they're designed to do. There are other things that light up, like displays in equipment or appliances. We could go on, but we can't get much more specific with this general question.

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16y ago

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Do night lights plugged in but not on use energy?

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