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This is why you let an incandescent bulb cool off before unscrewing it. They also burn out frequently, requiring replacement roughly every year. The light-emitting components in LED bulbs, by ...
Fixtures for flashing lights (such as for advertising) use a ballast that maintains cathode temperature when the arc is off, preserving the life of the lamp. The extra energy used to start a fluorescent lamp is equivalent to a few seconds of normal operation; it is more energy-efficient to switch off lamps when not required for several minutes.
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