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Satco S7301 - 9 Watt CFL Light Bulb - Compact Fluorescent - G25 - 40 W Equal - 2700K Warm White - 82 CRI - 55 Lumens per Watt - 15 Month Warranty - Incandescent Bulbs - Amazon.com
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Why LED lights are better than Fluorescent lights even when lumens per watts are the same - Bijli Bachao : Bijli Bachao
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LED light bulbs keep improving in efficiency and quality - Today in Energy - U.S. Energy Information Administration (EIA)
LED light bulbs are rated in watts & lumens but not efficiency. How do you determine the efficiency? Is there a rating of useful light to input? - Quora
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