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Lighting Efficiency – eTool Support
Energy-efficient lighting | What is the cheapest energy? The energy that is not used! | Learn | En | Maison ERE 132 - Bâtir, c'est choisir! Vitrine d'excellence en écoconstruction
Efficiency of LEDs: The highest luminous efficacy of a white LED - www.dial.de
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LED lighting efficacy: Status and directions - ScienceDirect