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A metal-halide lamp is an electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides [1] [2] (compounds of metals with bromine or iodine). It is a type of high-intensity discharge (HID) gas discharge lamp . [ 1 ]
Aviation obstruction lighting is used to enhance the visibility of structures or fixed obstacles which may conflict with the safe navigation of aircraft. Obstruction lighting is commonly installed on towers, buildings, and even fences located in areas where aircraft may be operating at low altitudes.
In 1798, he used gas to light the main building of the Soho Foundry and in 1802 lit the outside in a public display of gas lighting, the lights astonishing the local population. Streetlights from an 1871 catalog. The first public street lighting with gas was demonstrated in Pall Mall, London on 4 June 1807 by Frederick Albert Winsor. [16]
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