Light fixture
A device that holds and distributes electric light, typically combining a lamp or socket with a housing and electrical connections.
Lamp (lighting): A device that produces light when powered by electricity or another energy source. The light source mounted in or integrated into a fixture.
Lighting control system: Hardware and software that adjust electric lighting in response to users, schedules, or sensors. Controls may dim or switch fixtures to match occupancy and desired light levels.
Recessed light: A light fixture installed within a ceiling or other surface, leaving much of its body concealed. It provides a low-profile option for general or accent lighting.
Light bulb: A replaceable electric light source, commonly enclosed in a glass or plastic envelope. A bulb produces light; the fixture holds, powers, and distributes it.
Lamp holder: A component that supports a lamp and connects it to an electrical circuit. Its socket secures a replaceable lamp and supplies power.
LED driver: An electronic power supply that provides LEDs with regulated current or voltage. LED fixtures need a driver matched to their light-emitting components.
Track lighting: A lighting system that mounts adjustable fixtures along an electrified track. Movable heads let one installation serve changing display or task needs.
Portable lamp: A movable electric lighting device, often combining a base, shade, and light source. Unlike a fixed fixture, it is designed to be repositioned without installation.
Luminaire: A complete lighting unit that distributes light and includes the parts needed to support and connect its light source. This technical term emphasizes the fixture as a complete optical and electrical unit.
Photometry: The measurement of light according to the sensitivity of human vision. Photometric data describes how much light a fixture emits and where it goes.