U.S. Cities like Raleigh, Ann Arbor, Los Angeles, San Jose, and San Francisco have begun to introduce LEDs for street and parking garage lighting. Toronto, Canada, Tianjin, China, and Torraca, Italy have also adopted environmentally-friendly LEDs.
LEDS are considered to be twice as efficienct as compact-fluorescent bulbs. They also turn on quickly, are compatible with dimmer switches and don't contain mercury, a component in CFLs. They do not contain toxic materials, which is a huge concerns with CFL disposal, and essentially last a life time. According to the New York Times:
Studies suggest that a complete conversion to the lights could decrease carbon dioxide emissions from electric power use for lighting by up to 50 percent in just over 20 years; in the United States, lighting accounts for about 6 percent of all energy use. A recent report by McKinsey & Company cited conversion to LED lighting as potentially the most cost effective of a number of simple approaches to tackling global warming using existing technology.
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