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The slightly more decorative 18 pole is generally used only in the downtown area. The Twin-20 pole is the double-globe version of the 18 pole, and is used downtown, in historic districts, and at entry points into the city. The 16 and 18 poles have a 24-inch (61 cm) base, a 15-inch (38 cm) bolt circle, and accommodate a 70-400 watt lamp.
'BT' – to mark it as a British Telecom UK Pole (This can also be PO (Post Office) or GPO (General Post Office) depending on the age of the pole) a horizontal line marking 3 metres from the bottom of the pole; the pole length, typically 8 to 10 metres, [22] and size. 9L is a 9 metres long, light pole, other letters used are 'M' (Medium) and 'S ...
A Belisha beacon atop its striped pole. This example also features a spot lamp to illuminate the crossing at night. A Belisha beacon (/ b ə ˈ l iː ʃ ə /) is a yellow-coloured globe lamp atop a tall black and white striped pole, marking pedestrian crossings of roads in the United Kingdom, [1] Ireland, and other countries historically influenced by Britain, such as Hong Kong, Cyprus, Malta ...
The long defunct Chicago Signal Company had a version that used standard 5 + 3 ⁄ 8-inch (140 mm) switch lamp lenses (often of Macbeth manufacture) instead of the otherwise standard inverse-convex and stepped lens type found in the standard inner-doublet design. The Union version was later updated to a single unit akin to the GRS model.
The pole that the lighting is mounted on is generally at least 30 m (98 ft) tall (under this height it is referred to as conventional lighting system), [1] while the lighting consists of a luminaire ring surrounding the pole with one or several independent lighting fixtures mounted around it. Most units have four, six or eight lights in the ...
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