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    Low pressure sodium vapor (LPS) lights are a specific type of gas-discharge light. The bulb contains solid sodium metal inside a borosilicate glass tube that vaporizes once the lamp is turned on. LPS lamps have a borosilicate glass gas discharge tube containing solid sodium and a small amount of neon and argon gas in a Penning mixture to start the gas discharge. LPS lighting causes the lowest environmental impacts of any currently available outdoor lighting source. It was traditionally used for street lighting, tunnel lighting, and other industrial forms of lighting that did not require high color rendering index.
    stouchlighting.com+3
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    Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium
    Low pressure sodium vapor (LPS) lights are a specific type of gas-discharge light (also known as a high intensity discharge, HID or arc light). The bulb principally contains solid …
    Stouch Lighting
    https://www.stouchlighting.com/blog/led-vs-hps-lps-high-and-low-pressure-sodium
    Sodium-vapor lamp - Wikipedia
    Low-pressure sodium (LPS) lamps have a borosilicate glass gas discharge tube (arc tube) containing solid sodium and a small amount of neon and argon gas in a Penning mixture to sta…
    Wikipedia
    https://en.wikipedia.org/wiki/Sodium-vapor_lamp
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    Low Pressure Sodium Lighting - Flagstaff Dark Skies Coalition
    Low-pressure sodium lighting causes, overall, the lowest environmental impacts of any currently available outdoor lighting source – it causes by far the lowest visible sky glow; us…
    flagstaffdarkskies.org
    https://flagstaffdarkskies.org/low-pressure-sodium-lighting/
    LED Color Match for Low Pressure Sodium Lamps - 1700K - Access Fixtures
    For starters, it’s a form of induction lighting that is actually a closer cousin to fluorescent and neon lamps than to high pressure sodium lighting. Low pressure sodium lamps were…
    Access Fixtures
    https://www.accessfixtures.com/led-equivalent-for-low-pressure-sodium-lamps/
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