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High efficacy electrodeless high intensity discharge lamp

  • US 4,972,120 A
  • Filed: 05/08/1989
  • Issued: 11/20/1990
  • Est. Priority Date: 05/08/1989
  • Status: Expired due to Fees
First Claim
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1. An electrodeless metal halide high intensity discharge lamp, comprising:

  • a light transmissive arc tube for containing an arc discharge;

    a fill disposed in said arc tube, said fill including lanthanum halide, sodium halide and cerium halide, said halides being selected from the group consisting of iodides, chlorides and bromides, including mixtures thereof, said halides being combined in weight proportions to generate white color lamp emission exhibiting improved efficacy and color rendition;

    said fill further including a buffer gas selected from the group consisting of xenon and krypton, said buffer gas being present in sufficient quantity to limit chemical transport of energy from said arc discharge to the walls of said arc tube; and

    excitation means for coupling radio frequency energy to said fill.

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