What are High Pressure Sodium Light Bulbs? from Commercial Lighting Experts.
High Pressure Sodium Lamps
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Sodium-vapor lamp - Wikipedia
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The Sodium Lamp - How it works and history
Sunlite 03615-SU LU100/MED 100-Watt HPS ED17 High Pressure Sodium Light Bulb, Medium Base, Clear, Incandescent Bulbs - Amazon Canada
High-Pressure Sodium Bulb - 70 W from XTRICITY | BMR
