New high-pressure sodium (HPS) lamps have been designed to operate interchangeably with existing high-pressure mercury (HPM) lamps on certain types of HPM ballasts. These new lamps offer about 50 percent greater light output than HPM lamps at a 14 percent savings in energy consumption. Tests with a 150-watt interchangeable HPS lamp and a standard 175-watt HPM lamp on a 175-watt HPM ballast show that the interchangeable lamp has both a faster warm-up and a shorter hot restart time than the mercury lamp. Unlike mercury lamps, starting is not a function of ambient temperature, and the interchangeable HPS lamps are usable at extremely low temperatures.

  • Corporate Authors:

    Illuminating Engineering Society

    120 Wall Street, 17th Floor
    New York, NY  United States  10005-4001
  • Authors:
    • Collins, B R
    • McVey, C I
  • Publication Date: 1975-9

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 18-24
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00127045
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 18 1975 12:00AM