Low pressure sodium street lamp against a dusk sky Stock Photo - Alamy
File:2014-11-17 16 49 43 Sodium vapor street light on West Cedar Street in Elko, Nevada.JPG - Wikimedia Commons
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70w-150w High Pressure Sodium Street Light From China With Fitting - Buy 400 Watt Cobra Streetlight Housing,250w Hps Street Light,Metal Halide 400watt High Power Street Lamp Power Product on Alibaba.com
File:Low pressure sodium vapor streetlights in Springfield (7967029974).jpg - Wikimedia Commons
File:Low pressure sodium street lamp.jpg - Wikimedia Commons
GE M250R1 35watt High Pressure Sodium Street Light - YouTube
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Sodium-vapor lamp - Wikipedia
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