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Incandescent bulbs generate light through resistive heating of a tungsten filament, to such a point that the filament glows and provides light. This resistive heating produces large amounts of waste heat and a relatively small amount of power translated into light. In an LED, there is relatively little waste heat, as photons (packets of light) are directly generated. Although it is much more efficient of a light emitter than an incandescent light, there is some small amount of heat generated.

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