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An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a filament that is heated until it glows. The filament is enclosed in a glass bulb that is either evacuated or filled with inert gas to protect the filament from oxidation .
High-output lamps are brighter and are driven at a higher electric current. They have a recessed double contact (R17d) base on each end, rather than a standard bi-pin base, which prevents them from being installed into the wrong fixture. Since about the early to mid-1950s to today, General Electric has developed and improved the Power Groove lamp.
Lamp bulbs with dual carbon filaments were built as early as 1902 to allow adjustable lighting levels. [1] Certain compact fluorescent lamp bulbs are designed to replace 3-way incandescent bulbs, [2] and have an extra contact and circuitry to dim to a similar light level. In recent years, LED 3-way bulbs have become available as well. [3]
Nikola Tesla made similar experiments in the 1890s, devising high-frequency powered fluorescent bulbs that gave a bright greenish light, but as with Edison's devices, no commercial success was achieved. One of Edison's former employees created a gas-discharge lamp that achieved a measure of commercial success.
The Centennial Light was originally a 60-watt bulb, but has since dimmed significantly and is now as bright as a 4-watt bulb. [ 7 ] [ 8 ] [ 9 ] The hand-blown, carbon-filament common light bulb was invented by Adolphe Chaillet , a French engineer who filed a patent for this socket technology. [ 10 ]
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