IEEE Spectrum October, 2016 - 44

Y o u m a Y h a v e n o t i c e d t h e m going up in
your town's streets and parking lots: a new generation
of pole-mounted lights that pour down a cool torrent of
lumens from an array of light-emitting diodes. Like me,
you might have welcomed this development. LEDs are,
after all, the most energy-efficient lighting option on the
market. They can last twice as long as ordinary sodiumvapor streetlights, and their prices have dropped to
within range of the competition.
If the switch to LEDs had needed any more support, it
came from growing evidence about climate change. In
the United States, street lighting accounts for a whopping
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44

30 percent of all the energy used to generate electricity for
outdoor lighting. Another 60 percent goes toward lighting parking lots and garages, and much of that energy is
still produced by fossil-fired power plants. Consultants
at the firm Navigant, in Chicago, have estimated that
the United States could save 662 trillion British thermal
units-the energy needed to power 5.8 million typical
U.S. homes for one year-by converting all remaining
non-LED outdoor lighting to LEDs.
Armed with statistics like these, and a mandate to cut
energy use wherever they can, municipalities across
the United States have installed more than 5.7 million



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Table of Contents for the Digital Edition of IEEE Spectrum October, 2016

IEEE Spectrum October, 2016 - Cover1
IEEE Spectrum October, 2016 - Cover2
IEEE Spectrum October, 2016 - 1
IEEE Spectrum October, 2016 - 2
IEEE Spectrum October, 2016 - 3
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IEEE Spectrum October, 2016 - 72
IEEE Spectrum October, 2016 - Cover3
IEEE Spectrum October, 2016 - Cover4
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