A version of this article by Eric A Taub appeared in print on Nov. 30 on page B6 of the New York edition of the New York Times:
Does the latest generation of energy-saving light bulbs save energy? A comprehensive study conducted by Osram, the German lighting company, provides evidence that they do.
Rick Friedman for The New York Times
A standard incandescent bulb over its life will use almost five times the energy of an LED bulb, a German study concluded.
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While that may seem self-evident, until the release of the report on Monday the answer remained unclear.
That is because no one knew if the production of LED lamps required more energy than needed for standard incandescent bulbs.
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