Home > Terms > English, UK (UE) > High-pressure sodium (HPS)
High-pressure sodium (HPS)
High-pressure sodium (HPS) lamps are smaller and contain additional elements such as mercury, and produce a dark pink glow when first struck, and a pinkish orange light when warmed. Some bulbs also briefly produce a pure to bluish white light in between. This is probably from the mercury glowing before the sodium is completely warmed. The sodium D-line is the main source of light from the HPS lamp, and it is extremely pressure broadened by the high sodium pressures in the lamp; because of this broadening and the emissions from mercury, colours of objects under these lamps can be distinguished.
- Part of Speech: noun
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- Industry/Domain: Lights & lighting
- Category: Lighting bulbs & tubes
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