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How efficient are high-pressure sodium lamps?

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The high-pressure sodium (HPS) lamp has the highest lamp efficiency of all lamps commonly used indoors. It produces a golden-white light when electricity passes through a sodium vapor. The low-pressure sodium (LPS) lamp, the most efficient of all, is used where color is not important because all colors illuminated by an LPS light source appear as tones of gray or yellow.

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Similar questions: What is the primary drawback to using LPS lamps? How do low-pressure sodium lights differ from HPS lamps? What are the characteristics of HPS light? [ Hide these questions ]

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