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Sodium-vapor lamp - Wikipedia
HPS (High Pressure Sodium) Light Bulbs - 1000Bulbs.com
Amazon.com: High Pressure Sodium Lights
High Pressure Sodium Vapor Lamp: Definition, Working
Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium
What are High Pressure Sodium Light Bulbs? - Superior Lighting
Amazon.com: High Pressure Sodium Lamps
SON high pressure sodium - Philips Lighting
High Pressure Sodium - Industrial Light and Power
What are high-pressure sodium lights? - Electronic Specifier