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The Sodium Lamp - How it works and history
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What are High Pressure Sodium Light Bulbs? from Commercial Lighting Experts.
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Sunlite 03635-SU LU150/MOG 150 Watt High Pressure Sodium Light Bulb, Mogul Base (E39), ANSI Code S55, 16000 Lumen, 20000 Life Hours, Clear, 2100K - High Intensity Discharge Bulbs - Amazon.com
Sunlite 03620-SU LU150/MED High Pressure Sodium Light Bulb, 150 Watts, ED17/MED, Medium Base (E26), ANSI Code S55, 15000 Lumen, 20000 Life Hours, Clear, 2100K - High Intensity Discharge Bulbs - Amazon.com
Sodium-vapor lamp - Wikipedia
Sodium-vapor lamp - Wikipedia
Palomar Skies: Why Astronomers Love Low-Pressure Sodium Lights
LED Vs. High-Pressure Sodium/Low-Pressure Sodium - LEDYi Lighting
Sylvania 67572 - LU250/PLUS/ECO High Pressure Sodium Light Bulb - High Intensity Discharge Bulbs - Amazon.com
The Sodium Lamp - How it works and history
