400 Optoelectronics

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Incandescent Lamps

Applications Field

Incandescent lamps are an incredibly common form of light source, found in nearly every home in the developed world. They are used primarily for residential lighting, but also find considerable applications in commercial contexts, such as in retail stores or restaurants. Incandescent lamps are also used in automobiles, and to light outdoor areas, such as streets or parks, as well as theatrical application.

Working Principle

The working principle behind incandescent lamps is fairly straightforward. Inside the lamp\'s glass bulb, a filament made of a material such as tungsten is suspended in a vacuum. When current is applied to the filament, it heats up to a very high temperature, causing it to emit visible light. The transfer of electrical energy to thermal energy is very efficient, producing a high luminosity for relatively low levels of electrical power. The most common type of incandescent lamp is an A-lamp, in which the filament is rooted at two points and assumes an arched shape.

Neon Lamps

Applications Field

Neon lamps are another form of light source, typically found in the form of advertising signs. They are also widely used in decorative applications, such as in theaters. Neon lamps are used to light up exterior signage and architectural features, as well as public art. They are also widely used in interior settings, as nighttime ambient lighting in bars and restaurants.

Working Principle

The working principle behind neon lamps is dissociatively similar to that of incandescent lamps. However, instead of using a vacuum and a tungsten filament, neon lamps utilize an inert gas such as neon, krypton, or xenon. When the inert gas is exposed to electric current, the gas particles become charged, allowing electrons to flow freely between the particles, resulting in the production of light. Neon lamps produce light of a specific wavelength, which is why they are so often found in neon signs.

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