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8-12m 150W-400W High Pressure Sodium Street Lights Outdoor Highway Street Light
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Street Lamp | Full cut-off high pressure sodium street light… | Flickr
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The High Pressure Sodium Lamp (HPS) - YouTube
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The spectrum and color of sodium low pressure lamps - ACTION Project
File:High Pressure Sodium street lamp.jpg - Wikimedia Commons
LED street light is rapidly replacing high pressure sodium lamp | Eneltec Group
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PPL Electric Utilities
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