CHICAGO, Nov. 14 -- Energy savings from solid-state lighting -- light-emitting diodes (LEDs) and organic light-emitting diodes (OLEDs) -- in niche and general lighting applications are the focus of two US Department of Energy (DOE) studies, performed by independent consulting firm Navigant Consulting. The research found that energy savings to date from LEDs exceed the power produced from one large electric power plant, or more than 8 billion kilowatt-hours. 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