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| street light controller ： ウィキペディア英語版 |
street light controller
Street light controllers are smarter versions of the mechanical or electronic timers previously used for street light ON-OFF operation. They come with energy conservation options like twilight saving, staggering or dimming. Also many street light controllers come with an astronomical clock for a particular location or a Global Positioning System (GPS) connection to give the best ON-OFF time and energy saving.
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==Economics==
Street light controllers can be expensive in comparison with normal timers, and can cost between $100 and $2500, but most of them return the investment between 6 months and 2 years. As the equipment's lifetime is 7 to 10 years it saves energy and cost for some years.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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