World Heritage in a New Light

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Streetlights that use light-emitting diodes (LEDs) cut electricity consumption by up to 80 percent. Not only are LEDs efficient; their light can also be optimally directed
En: Pictures of the future (nro. , Spring 2010), p. 54-55S.T.:H001 PIC PP3723
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Streetlights that use light-emitting diodes (LEDs) cut electricity consumption by up to 80 percent. Not only are LEDs efficient; their light can also be optimally directed

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