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Regular light bulbs work as heaters while giving light.

More than half the power used by Incandescent Bulbs goes to heating your room, rather than lighting it.

Most household electricity supplies come from rainwater flowing downhill (Hydroelectricity), or boiling water to drive steam turbines with coal, oil or nuclear heaters.

Fluorescent lights emit a narrower range of light wavelengths, using their input power more efficiently.

LED lights emit on an even narrower range of light, so are brighter within their colour.

Lasers can be even more efficient, but they are often so focussed and one coloured that they are not very useful for household lighting.

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16y ago

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