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An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a filament that is heated until it glows. The filament is enclosed in a glass bulb that is either evacuated or filled with inert gas to protect the filament from oxidation. Electric current is supplied to the filament by terminals or wires ...
The excessive heat produced by incandescent light bulbs is frequently seen as a drawback, but it is seen as an advantage in certain applications. For example, automotive applications in cold climates benefit from the radiated heat as it melts potentially visually-obstructive snow and ice on warning lights and signs.
Only roughly 5% of the energy used by an incandescent bulb produces light; the remaining 95% or so is lost as heat. This is why you let an incandescent bulb cool off before unscrewing it.
As of 2011, incandescent lighting was the most common type used in homes, delivering about 85% of household illumination. [2] To produce light, incandescent light bulbs convert electricity to heat, heating a filament to the point where it glows; a portion of the heat is thus converted to light.
They were famously used to heat up food in the original Easy-Bake ovens. For comparison, for standard Christmas tree lights, incandescent bulbs use 20 watts. For LEDs, the energy used is only 2.4 ...
LED light bulbs create light by passing an electrical current through a microchip, whereas incandescents heat a filament that produces light. White LED bulbs first gained traction in the ...
An incandescent lamp's light is thermal radiation, and the bulb approximates an ideal black-body radiator, so its color temperature is essentially the temperature of the filament. Thus a relatively low temperature emits a dull red and a high temperature emits the almost white of the traditional incandescent light bulb.
The incandescent light bulb creates light by heating a filament to a temperature at which it emits significant visible thermal radiation. For a tungsten filament at a typical temperature of 3000 K, only a small fraction of the emitted radiation is visible, and the majority is infrared light.
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