90 Optoelectronics

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Lamps are devices used to provide illumination for a wide range of applications. In general terms, they are light sources that convert electricity into visible light. There are many types of lamps available, each with their own unique features and characteristics. These categories include incandescents, fluorescents, LED, and neon.Incandescent lamps are commonly referred to as “bulbs”. They are the most commonly used lamps in the home and produce relatively bright light without consuming too much energy. The bulb is made up of a glass envelope that contains a filament, usually made of tungsten, which passes current when it is heated by the flow of electricity. As the filament is heated, it emits a visible light that is also accompanied by infrared radiation and some ultraviolet. The main disadvantage associated with incandescents is the lack of efficiency, as most of the electricity is converted into heat rather than directly into light.Neon lamps are comprised of a sealed glass envelope that contains a combination of phosphors and metal electrodes. When an electric current is passed through the lamp, the phosphors are activated, producing a glowing, visible light. The most common use of neon lamps is in signage, as they are available in a range of colours and can produce bright light even in low light conditions. The main disadvantage of neon lamps is the high cost associated with them.In summary, lamps are used for a wide range of applications, from providing illumination to signage. Incandescent lamps, the most common type, produce visible light by heating a filament with an electric current. Neon lamps are made up of a sealed glass envelope that contains phosphors and metal electrodes, and they produce coloured light even in low light conditions. However, they are expensive to use.

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