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What are High Pressure Sodium Light Bulbs? from Commercial Lighting Experts.
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LED lighting increases the ecological impact of light pollution irrespective of color temperature - Pawson - 2014 - Ecological Applications - Wiley Online Library
Sodium-vapor lamp - Wikipedia
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Sodium-vapor lamp - Wikipedia
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Sodium-vapor lamp - Wikipedia
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Low Pressure Sodium Lamp Tunnel Road Lamp 26W - China Low Pressure Sodium Lamp, Sox Lamp | Made-in-China.com
