Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium
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What are High Pressure Sodium Light Bulbs? from Commercial Lighting Experts.
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The Sodium Lamp - How it works and history
Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium
Low Pressure Sodium Lighting - Flagstaff Dark Skies Coalition
Palomar Skies: Why Astronomers Love Low-Pressure Sodium Lights
What is High Pressure Sodium (HPS)? - Definition from Maximum Yield
