Lighty Bulb 2 Answers
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Most of the light bulbs in homes and businesses are incandescent bulbs. The typical domestic bulb uses 5 to 15 watts, and incandescent bulbs are the most common bulbs in the United States. A 60-watt incandescent bulb has a typical lifespan of three to eight years, although some bulbs may last up to ten years. It is also possible to exceed the normal lifespan of incandescent bulbs. Typical household bulbs are often dimmed to conserve energy, and the bulbs are often replaced more often than necessary. In the United States, the cost of electricity has not risen as fast as the cost of electricity in many other countries, so the cost of running incandescent bulbs is much lower than that of running halogens or other type of bulbs in other countries.
Filaments in light bulbs are typically made from natural or synthetic materials and are electrically heated to emit light. The most common type of bulb uses a tungsten filament, however, other filaments, such as those made from molybdenum and carbon, are used. Light bulbs can be manufactured using filament materials other than tungsten. In fact, the choice of filament is part of the design process, and there is often a trade-off between the aesthetic appeal of the bulb and its efficiency.
Incandescent lamps are used in a wide variety of applications. Commercial incandescent bulbs include the floodlight, tracklight, searchlight, spotlight, and spotlight bulbs, which are used for illuminating wide areas, usually outdoors. Lamp bulbs are also used in flashlights, automobile headlamps, bicycle lights, automotive taillights, table lamps, display lights, and indoor decorative and advertising lighting. High-intensity discharge lamps that are also used for many of the same applications have less power requirements, last a shorter time, have higher color rendering index, and are safer to use; however, they require external ballasts and regulators and are much more expensive than incandescent lamps.
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