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Date: 2011-11-22 17:20:28Architecture Light sources Light pollution Light-emitting diodes Light fixture Street light Mercury-vapor lamp Sodium-vapor lamp High-intensity discharge lamp Lighting Light Gas discharge lamps | MD of Foothills No. 31 Dark Sky Bylaw Keeping the Night Skies Dark – 2011Add to Reading ListSource URL: www.mdfoothills.comDownload Document from Source WebsiteFile Size: 2,80 MBShare Document on Facebook |