How Do Light Bulbs Work?

Victor Rivera
5 min readNov 28, 2021
how does the light bulb works
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A light bulb is a device that emits light from a thin filament inside a glass or metallic, evacuated lamp. The illumination consists of some combination of visible and invisible components, which may be used to produce white light. Most bulbs use a metal filament that heats up due to electric current passing through it. The heat causes the filament to emit light as it cools down, releasing energy in the form of photons. Learn how the different types of light bulbs work and their advantages and disadvantages.

how do smart light bulbs work
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What Is The Difference Between Fluorescent, Incandescent, And Led Bulbs?

The three main types of light bulbs vary in how they produce light, but all work by heating a filament, or “Wire”, to a temperature where it emits light.

how light bulb works
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Fluorescent bulbs contain a low-pressure mercury vapor that is excited by electricity, which then produces ultraviolet light. This UV light then reacts with a phosphor coating on the inside of the bulb to produce visible light.

how do led light bulbs work
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In contrast, incandescent bulbs commonly found in traditional light bulbs consist of a high-pressure vapor of tungsten metal. The heat from the filaments excites the electrons within the metal, causing them to release photons.

how do incandescent light bulbs work
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Finally, LED bulbs contain a solid piece of semiconductor that emits light when a current passes through it. LED bulbs are typically more expensive than other types of bulbs, but they last much longer and have a higher efficiency rating.