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The mall has unusual, decorative pavement lights let into its polychrome tile floor, to allow light from the glass dome skylights into the basement level. There also are vault lights in other locations, such as in the old post office building. [7] Chicago, Illinois, has extremely extensive sidewalk vaults, but many of them do not have vault ...
Street lighting systems require ongoing maintenance, which can be classified as either reactive or preventative. Reactive maintenance is a direct response to a lighting failure, such as replacing a discharge lamp after it has failed or replacing an entire lighting unit after it has been hit by a vehicle.
In 2009, PSE&G in New Jersey became the first utility in the US to use induction fluorescent lamps to replace mercury vapor lamps, in 220 municipalities. [24] The induction lamps were expected to last 100,000 hours before requiring maintenance and consume 30 to 40 percent less electricity, thereby saving an estimated $1 million annually. [24]
Miniature lamps may have a wedge base made of glass or plastic. The base may be an extension of the glass envelope of the bulb, with the wire leads of the lamp folded up at the base. Some wedge bases are made of plastic and slipped over the wire leads. A wedge base holds the lamp by spring compression in the socket.
However, each manufacturer has a slightly different type of wedge base differing in exact dimensions (or even hexagonal instead of round), so the plastic bases often need to be swapped when replacing bulbs. (The wedge bases are now usually not even supplied with the bulbs, which cost nearly as much as buying a new set, typically 10 bulbs for a ...
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