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A low-pressure sodium lamp (LPS) is a gas discharge lamp that uses sodium in an excited state to produce light. It has a glass tube containing solid sodium and a small amount of neon and argon gas. It emits a dim red/pink light at first, then a bright yellow light when the sodium vaporizes. It has some advantages for road and tunnel lighting, such as low glare, low surface luminance, and reduced accident rates. These lamps are mostly used for street lighting as well as industrial uses
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