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Permanent light fixtures, such as dining room chandeliers, may have no switch on the fixture itself, but rely on a wall switch. Fixtures require an electrical connection to a power source, typically AC mains power, but some run on battery power for camping or emergency lights. Permanent lighting fixtures are directly wired.
A sconce or wall light is a decorative light fixture that is mounted to a wall. [1] The sconce is a very old form of fixture, historically used with candles and oil lamps . They can provide general room lighting, and are common in hallways and corridors, but they may be mostly decorative. [ 1 ]
A light fixture or luminaire is a technical and professional term for the electrical fixtures used to hold a lamp—a light bulb—the light source. Wikimedia Commons has media related to Lighting fixtures .
The height of a rack can vary from a few inches, such as in a broadcast console, to a floor-mounted rack whose interior is 45 rack units (200.2 centimetres or 78.82 inches) high. 42U is a common configuration. Many wall-mounted enclosures for industrial equipment use 19-inch racks.
An important property of light fixtures is the luminous efficacy or wall-plug efficiency, meaning the amount of usable light emanating from the fixture per used energy, usually measured in lumen per watt. A fixture using replaceable light sources can also have its efficiency quoted as the percentage of light passed from the "bulb" to the ...
In industrial installations, walkway lighting may be mounted with a stanchion that is secured to a hand-rail. Stanchion lights are typically spaced 50 feet (15.24 m) along walkways, such as conveyor platforms. Stanchions (balusters or bollards) are also the upright posts inserted into the ground or floor to protect the corner of a wall.