Wiktionary
n. A complete lighting unit, composed of a housing attached to a wall or ceiling, and a mount for a light source.
Wikipedia
A light fixture (US English), light fitting (UK English), or luminaire is an electrical device used to create artificial light by use of an electric lamp. All light fixtures have a fixture body and a light socket to hold the lamp and allow for its replacement. Fixtures may also have a switch to control the light. Fixtures require an electrical connection to a power source; permanent lighting may be directly wired, and moveable lamps have a plug. Light fixtures may also have other features, such as reflectors for directing the light, an aperture (with or without a lens), an outer shell or housing for lamp alignment and protection, and an electrical ballast or power supply. A wide variety of special light fixtures are created for use in the automotive lighting industry, aerospace, marine and medicine.
Portable light fixtures are often called "lamps", as in table lamp or desk lamp. In technical terminology, the lamp is the light source, which is typically called the light bulb.
The term luminaire is recommended by the International Electrotechnical Commission (IEC) for technical use.
Usage examples of "light fixture".
The light fixture that looked like hanging lemon drops, still hovered over the place where the table had been, near the wide window that overlooked the garden.
As the chains of the swinging light fixture torqued, the links twisted against one another with enough friction to cause an eerie grining, as if lizard-eyed altar boys in blood-soaked cassocks and surplices were ringing the unmelodious bells of a satanic mass.
A light fixture made from a wagon wheel hung in one corner of the room.
To the left, the ceiling's light fixture, which is rectangular and featureless, and then a row of beds, three at least, which are empty, and made of white-painted metal.
Then, once more picking up the light fixture, he resumed work on it.
The rooms were the approximate size of a walk-in closet and the sole light fixture in the kitchen was an overhead outlet that had arrived sans cover.