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As prices fall, use of cost-saving LEDs increases

Ashley Jones and Ben Feder try to be energy-efficient in every aspect of their lives. The Wilkinsburg newlyweds' apartment uses wind-generated electricity, which they buy from Green Mountain Energy, and a programmable thermostat that they can control from their cellphones and that automatically responds to the couple's usage. They limit how long they run water and use lights. Still, they didn't invest in light-emitting diode light bulbs, or LEDs, until they saw them on sale about six months ago.

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