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A shiny new way with LEDs - CPS Energy Newsroom
LED street light is rapidly replacing high pressure sodium lamp | Eneltec Group
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Palomar Skies: Why Astronomers Love Low-Pressure Sodium Lights
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How come when you look down from an airplane at night you only see yellow and not white lights? - Quora
The Sodium Lamp - How it works and history
The spectrum and color of sodium low pressure lamps - ACTION Project
