The Sodium Lamp - How it works and history
File:LPS Lamp 35W running.jpg - Wikimedia Commons
LED Color Match for Low Pressure Sodium Lamps - 1700K
Light Pollution (Sources of Light Pollution) - Hampshire Astronomical Group (HAG) - Clanfield Observatory
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The Sodium Lamp - How it works and history
The Sodium Lamp - How it works and history
LpS Digital – Conference and Exhibition for the Lighting World
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Palomar Skies: Why Astronomers Love Low-Pressure Sodium Lights
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Specifications of the LPS and LED street lights used in this... | Download Table
High pressure sodium
Sodium-vapor lamp - Wikipedia
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Low-pressure sodium lamp (LPS) - Stock Image - C019/8526 - Science Photo Library
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Palomar Skies: Why Astronomers Love Low-Pressure Sodium Lights
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The Sodium Lamp - How it works and history
