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Do lights use more energy to warm up?

This week’s question comes from Susan Fiore:

> I was brought up to turn the light off when I leave a room, even for a few minutes. My husband says it costs more to turn it off and back on again than leaving it on if you’re coming back soon.

> So which is right? And is it different for florescent, incandescent and halogen?

Can you help? Leave your answers to Susan’s question in the comments below

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