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The Sodium Lamp - How it works and history
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Sodium-vapor lamp - Wikipedia
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Sodium-vapor lamp - Wikipedia
Osram Sylvania GIDDS-685655 Clear Lumalux Ecologic High Pressure Sodium Lamp, Et23.5, 150W, 55V, E39 Mogul, 8" x 3" x 3" - - Amazon.com
Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium
What are High Pressure Sodium Light Bulbs? from Commercial Lighting Experts.
The Sodium Lamp - How it works and history
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737 Sodium Lamp Images, Stock Photos & Vectors | Shutterstock
Sylvania #67516 LU150/55 150 watt ET23.5 High Pressure Sodium Lamp, Mogul (E39) Base, 16000 lumens, 24,000hr Life - - Amazon.com
