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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site high-pressure sodium lamp A type of high-intensity discharge lamp that uses sodium under high pressure as the primary light-producing element. These high efficiency lights produce a golden white color and are used for interior industrial applications, such as in warehouses and manufacturing, and for security, street, and area lighting; they are 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. Like mercury vapor lamps, high-pressure sodium lamps have a lower color rendition index than metal halide lamps but longer lifetimes (16,000–24,000 hours). Related category    • LIGHTING TOPICS Source: US Department of Energy Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP