Warm White Vigo LPS Street Light, Input Voltage: 25, Model Name/Number: Srt123
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The Sodium Lamp - How it works and history
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Philips Lighting 151167 Low Pressure Sodium Lamp, 180 W, LPS Lamp, BY22d Lamp Base, T21 Shape, 32000 Lumens | Steiner Electric Company
The Sodium Lamp - How it works and history
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Palomar Skies: Why Astronomers Love Low-Pressure Sodium Lights
Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium
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A street full of old LPS streetlights. - YouTube
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