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Sodium-vapor lamp - Wikipedia
High Pressure Sodium Lamps
Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium
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What is High Pressure Sodium (HPS)? - Definition from Maximum Yield
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High Pressure Sodium – Industrial Light and Power
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Sodium-vapour lamp | instrument | Britannica
The Sodium Lamp - How it works and history
What are High Pressure Sodium Light Bulbs? from Commercial Lighting Experts.
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What are High Pressure Sodium Light Bulbs? from Commercial Lighting Experts.
The Sodium Lamp - How it works and history
Osram 281179 - High Pressure Sodium Light Bulb | LightBulbs.com
