Higher Pressure Sodium (HPS)

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High-pressure sodium lamps have a high light output and are described as "the most efficient white light source commercially available today". In a high pressure sodium lamp light is produced by sodium vapor, the gas pressure being about 15 kPa.

Source GREEN EFFORT Deliverable 11.1, Concept and Content Development - Existing energy saving means; White Paper #5, Terminal Lighting by LED and LEP; Pacific Energy Center Factsheet: High Pressure Sodium Lamps, http://www.pge.com/pec; http://www.lightinglab.fi/IEAAnnex45/guidebook/5_lighting%20technologies.pdf

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