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  • Most of the industrialized world is lit by electric lights, which are used both at night and to provide additional light during the daytime. These lights are normally powered by the electric grid, but some run on local generators, and emergency generators serve as backups in hospitals and other locations where a loss of power could be catastrophic. Battery-powered lights, usually called "flashlights" or "torches", are used for portability and as backups when the main lights fail. Types of electric lighting include: Different types of lights have vastly differing efficiencies and color of light. Color temperature is defined as the temperature of a black body emitting a similar spectrum; these spectra are quite different from those of black bodies. The most efficient source of electric light is the low-pressure sodium lamp. It produces an almost monochromatic orange light, which severely distorts color perception. For this reason, it is generally reserved for outdoor public lighting...
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  • Electric light
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