Incandescent lamp, incandescent light bulb
An incandescent lamp produces illumination by heating of an internal filament to generate radiant light. Incandescent bulbs are commonly used in a variety of applications to provide light. For example, incandescent bulbs may be used as a light source for illuminated switches, lighted panels, displays, legends, indicators, and in a variety of other applications. A typical incandescent bulb includes a filament made of a conductive material, a bulb which envelops the filament, and a noble gas which is filled in the bulb, and has a high color rendering property. Incandescent bulbs are widely used because they can be lighted using simple fixtures without using a lighting circuit such as a ballast, differently from discharge lamps. Although incandescent bulbs may provide a satisfactory degree of illumination, they also carry with them a number of disadvantages. Incandescent lamp filaments emit visible and non-visible radiation when an electric current of sufficient magnitude is passed through the filament. A substantial amount of energy radiated by an incandescent lamp filament, however, is in the form of non-visible radiation such as infrared radiation. As a consequence, the radiative efficiency of a typical tungsten filament is relatively low. Incandescent bulbs can generate enough heat to cause burns when used in some applications, such as in lighted switch or panel applications. In addition, incandescent bulbs have a relatively short life span, and may require frequent replacement. Likewise, many incandescent bulbs are prone to failure in high vibration environments.
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