High-Pressure Sodium Lamps
High-pressure sodium lighting—a type of high-intensity discharge lighting—is becoming the most common type of outdoor lighting.
High-pressure sodium lamps have an efficacy of 50–140 lumens per watt—an efficiency exceeded only by low-pressure sodium lamps. They produce a warm white light. Like mercury vapor lamps, high-pressure sodium lamps have poorer color rendition than metal halide lamps but longer lifetimes (16,000–24,000 hours).
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Product Information
National Lighting Product Information Program
Lighting Research Center - Rensselaer Polytechnic Institute
