To meet the growing demand for energy conservation and to reduce lighting costs, the feasibility of replacing 400-watt HP mercury lamps with 300-watt metal halide lamps in fixtures equipped with CW or CWA ballasts was investigated. A special 300-watt metal halide lamp was designed and tested for this purpose. The commercial 400-watt metal halide lamp served as the forerunner for the design. The 400-watt arc tube was scaled down to reduce the operating voltage and also the additive composition was adjusted. The composition consisted of iodides of sodium and scandium as well as mercury and argon. The lamp voltage of the final version was 102 plus/minus 8V. The operating current was 3.55 amps on the average. Apart from good compatibility with 400-watt CW or CWA ballast for HP mercury lamps, the 300-watt metal halide lamp has also superior initial lumen output, efficacy and color rendering ability. Intially, the lamp emits 24,000 + lumens, has an efficacy of at least 80 LPM, and its CRI is about 60. The power savings for the system, lamp plus ballast, amount to 22 to 25 percent. In these respects, the 300-watt metal halide lamp is superios to the H33-400/DX mercury lamp. /Author/

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  • Corporate Authors:

    University of Wisconsin Press

    Journals Department 129, Box 1379
    Madison, WI  United States  53701
  • Authors:
    • Kearney, J P
    • Sell, H G
  • Publication Date: 1977-7

Media Info

  • Pagination: p. 28
  • Serial:
    • Land Economics
    • Volume: 7
    • Issue Number: 7
    • Publisher: University of Wisconsin Press
    • ISSN: 0023-7639

Subject/Index Terms

Filing Info

  • Accession Number: 00159615
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 13 1977 12:00AM