Streetlights – International Dark Sky Association – Phoenix Area Chapter
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Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium
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Sunlite 03635-SU LU150/MOG 150 Watt High Pressure Sodium Light Bulb, Mogul Base (E39), ANSI Code S55, 16000 Lumen, 20000 Life Hours, Clear, 2100K - High Intensity Discharge Bulbs - Amazon.com
Like It or Not, Chicago's About to Get a Lot Less Orange – Chicago Magazine
File:High Pressure Sodium Lamps.JPG - Wikimedia Commons
PPL Electric Utilities
Street light conversion to LEDs underway throughout Ferndale | Whatcom News
Difference Between Low & High Pressure Sodium Lights | ehow
Low Pressure Sodium Lighting - Flagstaff Dark Skies Coalition
The LED's Challenge to High Pressure Sodium - YouTube
LED vs HPS Street Lights: What's Better in 2020? - HeiSolar
What are High Pressure Sodium Light Bulbs? from Commercial Lighting Experts.
Sodium-vapor lamp - Wikipedia
Feit Electric 150-Watt ED17 Shape Clear High Pressure Sodium E26 Medium Base HID Light Bulb (12-Pack) LU150/MED/HDRP/12 - The Home Depot
