File:Low Pressure Sodium lamp casing.jpg - Wikimedia Commons
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SOX Sodium, LPS or low pressure sodium lamp warming up. The lamp gradually turns from red to orange as the neon discharge warms the sodium metal up Stock Photo - Alamy
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OHLECTRIC 55 Watt T15 SOX55 Low-Pressure Sodium HID Light Bulb - 1800 Kelvin - Clear - BY22D Base - OL-50948 - Amazon.com
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low-pressure sodium lamp
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Low-pressure sodium vapour lamp SOX 35 W
Palomar Skies: Why Astronomers Love Low-Pressure Sodium Lights
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