Light Bulbs

The light bulb makes light by heating a metal filament wire to a high temperature until it glows. The hot filament is protected from air by a glass bulb that is filled with inert gas or evacuated.The light bulb is supplied with electrical current by feed-through terminals or wires embedded in the glass. Incandescent light bulbs are produced in a wide range of sizes, light output, and voltages.The incandescent light bulb is widely used in household and commercial lighting, for portable lighting such as table lamps, car headlamps, and flashlights, and for decorative and advertising lighting.Incandescent light bulbs are gradually being replaced in many applications by other types of electric lights, such as fluorescent lamps, compact fluorescent lamps, cold cathode fluorescent lamps, high-intensity discharge bulbs, and LED bulbs.