A light-bulb produces light from electricity. In addition to lighting a dark space, they can be used to show an electronic device is on, to direct traffic, for heat, and for many other purposes.Billions are in use, some even in outer space.. Early people used candles and oil lamps for light. Crude incandescent lights were made in the early and middle 19th century but had little use.

Light bulbs for automobiles are made in several standardized series. Bulbs used for headlamps, turn signals and brake lamps may be required to comply with international and national regulations governing the types of lamps used.Other automotive lighting applications such as auxiliary lamps or interior lighting may not be regulated, but common types are used by many …

A light fixture (US English), light fitting (UK English), or luminaire is an electrical device containing an electric lamp that provides illumination.All light fixtures have a fixture body and one or more lamps. The lamps may be in sockets for easy replacement—or, in the case of some LED fixtures, hard-wired in place.. Fixtures may also have a switch to control the light, either attached to ...