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Electrodeless high pressure sodium iodide arc lamp

  • US 4,783,615 A
  • Filed: 06/26/1985
  • Issued: 11/08/1988
  • Est. Priority Date: 06/26/1985
  • Status: Expired due to Fees
First Claim
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1. In an electrodeless metal halide arc lamp having an arc tube for containing an arc discharge, an arc tube fill for producing high luminous efficacy, said fill consisting essentially of:

  • sodium iodide present in a quantity which provides a reservoir of sodium iodide condensate during lamp operation;

    xenon in a sufficient quantity to provide a partial pressure in the range of about 100 torr and higher at room temperature and to limit the chemical transport of energy from said arc discharge to the walls of said arc tube; and

    mercury iodide in a quantity less than the quantity of said sodium iodide and in a sufficient quantity to provide an amount of free iodine near said arc tube walls during lamp operation.

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