In 1879, Thomas Edison created the first long-lasting electric light bulb. It burned for more than 14 hours. As of January 1, federal rules ban the manufacture or import of incandescent light bulbs that use 40 watts of power or more. This is the third phase of the Energy Independence and Security Act, energy efficiency legislation passed in 2007. About 8.2 billion light bulbs and tubes-known collectively as lamps-are installed in the United States, according to the National Lighting Bureau (nlb). Of those, 5.8 billion are located in homes and 2.1 billion are in commercial buildings. Converting all residential and commercial installations to more efficient lighting would save 176.25 billion kilowatt-hours per year and, following nlb's estimates on current electricity costs, Americans could save more than $20 billion per year.
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机译：1879年，托马斯·爱迪生（Thomas Edison）创造了第一个耐用的电灯泡。它燃烧了超过14个小时。自1月1日起，联邦法规禁止制造或进口使用40瓦或更高功率的白炽灯泡。这是《能源独立与安全法》（Energy Independence and Security Act）的第三阶段，该法律于2007年通过。美国国家照明局（nlb）表示，在美国安装了约82亿个灯泡和灯管，统称为灯。其中58亿位于住宅中，21亿位于商业建筑中。将所有住宅和商业设施转换为更高效的照明，每年将节省1762.5亿千瓦时，并且根据nlb对当前电力成本的估计，美国人每年可以节省超过200亿美元。
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