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Because the tungsten filament is evaporating. As the filament becomes thinner, resistance and temperature become higher, evaporation speeds up. Eventually the filament becomes so thin that it melts.

A 100 watt incandescent light bulb radiates 98 watts of heat and 2 watts of light. In summer, it takes 50 watts of air conditioning to get rid of the 98 watts of heat. A 20 watt compact fluorescent produces the same 2 watts of light while consuming 85% less electricity, and absence of heat makes it last ten times longer.

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