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A troffer is a rectangular light fixture that fits into a modular dropped ceiling grid (i.e. 2' by 2' or 2' by 4'). Troffer fixtures have typically been designed to accommodate standard fluorescent lamps (T12, T8, or T5), but are now often designed with integral LED sources. Troffers are typically recessed sitting above the ceiling grid, but ...
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.
Like the European modular furniture, display cabinets, ceiling tile grids, etc. they were designed for, these are based on multiples of the 300 mm (11.8 in) "metric foot" instead of the 12 in (305 mm) imperial foot, but are all 37 mm (1.5 in) shorter to allow space for the lampholder connections within the 300 mm modular units, and for much ...
Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures. The first fluorescent light bulb and fixture were displayed to the general public at the 1939 New York World's Fair. The spiral CFL was invented in 1976 by Edward E. Hammer, an engineer with General Electric, [7] in response to the 1973 oil crisis. [8]
In December, Edward led his army across the River Severn and advanced into the Welsh Marches, where the opposition forces had gathered. [213] The coalition of Marcher Lords crumbled and the Mortimers surrendered to Edward, [ 214 ] but Damory, Audley, and the Earl of Hereford marched north in January to join Lancaster, who had laid siege the ...
Christine Anne McVie (/ m ə k ˈ v iː /; née Perfect; 12 July 1943 – 30 November 2022) was an English musician.She was the keyboardist and one of the vocalists and songwriters of the rock band Fleetwood Mac.
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