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An energy efficient lamp delivers more lumens per watt for up to 4,000 hours of life. Even though they're still being improved, LEDs are already in the efficiency range of fluorescent tubes, and researchers predict that they'll ultimately deliver about 150 lumens per watt in commercial applications throughout a projected lifetime of at least 70,000 hours. According to Felder, OLED lighting is moving forward rapidly: "Last year we could produce only seven lumens per Watt. |
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