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Lu Standard (110V-130V) High Pressure Sodium Vapor Lamp/Bulb/Light - China High Pressure Sodium Lamp, Lu Standard Sodium Lamp | Made-in-China.com
Sylvania 69519 - SOX180 Low Pressure Sodium Light Bulb - Walmart.com
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Sunlite 03620-SU LU150/MED High Pressure Sodium Light Bulb, 150 Watts, ED17/MED, Medium Base (E26), ANSI Code S55, 15000 Lumen, 20000 Life Hours, Clear, 2100K - High Intensity Discharge Bulbs - Amazon.com
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Sodium-vapor lamp - Wikipedia
