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A light fixture (US English), light fitting (UK English), or luminaire is an electrical lighting device containing one or more light sources, such as lamps, and all the accessory components required for its operation to provide illumination to the environment. [1] All light fixtures have a fixture body and one or more lamps.
A PAR56, for example, is 56 eighths of an inch (7 inches) in diameter; a PAR36 is 36 eighths (4.5 inches) in diameter, and so on. Similarly, the diameter in millimeters can be found by multiplying the PAR designation by 3.175. For example, a PAR16 lamp is approximately 2 inches or 50.8 mm in diameter. [1]
Field angle is the angle of the beam of light where it reaches 10% of the intensity of the center of the beam. Most manufacturers now use field angle to indicate the fixture's spread typically in this series (5°, 10°, 19°, 26°, 36°, 50°, 75°, 90°). Older fixtures are described by the width of the lens x focal length of the instrument ...
Light fixtures - fixed location - line voltage (120 V U.S. or 240 V Europe) and low voltage (12 V U.S.) [2] Post mount - column mount; Address light; Wall mount; Ceiling mount - hanging fixture; Security lights; Tree lights - up and down lights; In-grade fixtures- uplights buried in-ground - top flush with surface; Adjustable aim "bullet" - uplight
Schematic diagram of longitudinal section 1 = Axis datum 2 = Light source 3 = Red filter 4 = Lenses 5 / 6 = Light beam- white/red. Optical construction: Two lamps for redundancy; Anodized aluminium reflectors; Red color filter; One or two lenses; Lamps and reflectors replaceable without recalibration. Each light unit consists of one or more ...
The history of electric light is well documented, [11] and with the developments in lighting technology the profession of lighting developed alongside it. The development of high-efficiency, low-cost fluorescent lamps led to a reliance on electric light and a uniform blanket approach to lighting, but the energy crisis of the 1970s required more design consideration and reinvigorated the use of ...
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[Note 2] If a lamp has a "G" code, [Note 3] this will mean the lamp is a bipin shape and the number following the G will indicate the distance in millimeters between the pins, usually either 4, 6.35 or 10; if the G is followed by a letter "Y", then the lamp's pins are thicker than normal— thus, a G6.35 has pins that are 1 mm in diameter but a ...