How were lights invented?
A light fixture is an electrical device that contains an electrical component called a lamp that provides illumination. All fixtures have a mounting housing and one or more bulbs. The bulbs may be in sockets for easy replacement.
Devices may also have a switch to control the light.
The lights require an electrical connection to a power source, usually AC power, but some are battery-operated for emergency lighting.
Lighting fixtures may also have other features such as reflectors to direct the light, a diaphragm (with or without a lens), an outer casing or housing to align and protect the lamp, an electrical ballast or power supply, and a shade to diffuse the light. Turn on or direct it toward a work area (e.g., a desk lamp).
Modern lighting began with the invention of the incandescent electric light bulb around 1870.
An incandescent lamp is a lamp in which a filament emits light when heated to incandescence by an electric current. The incandescent lamp was not the first lamp to use electricity; lighting devices that used an electric arc struck between carbon electrodes were developed in the early 19th century. These arc lamps, as they were called, were reliable but labor-intensive devices that were best used for street lighting.
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