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1962 Nick Holonyak Jr. develops the first practical visible-spectrum (red) light-emitting diode. 1963 Kurt Schmidt invents the first high pressure sodium-vapor lamp. [17] 1972 M. George Craford invents the first yellow light-emitting diode. 1972 Herbert Paul Maruska and Jacques Pankove create the first violet light-emitting diode.
An electric light, lamp, or light bulb is an electrical component that produces light. It is the most common form of artificial lighting . Lamps usually have a base made of ceramic , metal, glass, or plastic which secures the lamp in the socket of a light fixture , which is often called a "lamp" as well.
Incandescent street light in Ewing, New Jersey (2014) During the first two decades of the 20th century, there was intense competition among providers of various forms of street lighting, including carbon arc lamps; incandescent lamps; traditional coal gas lamps; and gasoline and naphtha street lamps. [3]
On July 24, 1874, Woodward and his partner, Mathew Evans, a hotel keeper, filed a Canadian patent application on an electric light bulb. [2] [3] It was granted on August 3, 1874, as Canadian patent number 3,738. [4] Woodward was a medical student at the time. Their light bulb comprised a glass tube with a large piece of carbon connected to two ...
Sir Joseph Wilson Swan FRS (31 October 1828 – 27 May 1914) was an English physicist, chemist, and inventor.He is known as an independent early developer of a successful incandescent light bulb, and is the person responsible for developing and supplying the first incandescent lights used to illuminate homes and public buildings, including the Savoy Theatre, London, in 1881.
The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the first decade of the 1800s, was the first practical electric light. [ 1 ] [ 2 ] It was widely used starting in the 1870s for street and large building lighting until it was superseded by the incandescent light in the early 20th ...
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Chaillet's light-bulb design involved flattening the elliptically looped carbon filament coil set transversely to the longitudinal axis of the lamp, as well as flattening the end of the globe, or bulb at its tip end, parallel to the loops, so that the greatest intensity of light is thrown downward when the bulb is hung from the ceiling.