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Optics & Photonics News - The Quest for Lumens per Watt
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New XLamp® CMB LEDs Deliver High Lumen Density & More Lumens Per Watt - Cree LED
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White LED lights with 135 Lumens per Watt About Ten Times Better than Incandescent | NextBigFuture.com
Ledrise - High Performance Led Lighting Luminous Efficacy and Useful Lumens: A Comprehensive Guide to Efficient Lighting Design