(19)
(11) EP 0 163 301 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.11.1987 Bulletin 1987/45

(43) Date of publication A2:
04.12.1985 Bulletin 1985/49

(21) Application number: 85106620

(22) Date of filing: 29.05.1985
(84) Designated Contracting States:
BE DE FR GB NL

(30) Priority: 29.05.1984 US 614903

(71) Applicant: GTE Products Corporation
 ()

(72) Inventors:
  • Keeffe, William M.
     ()
  • Krasko, Zeya K.
     ()

   


(54) Electrode positioning in metal halide lamps


(57) A low wattage metal halide discharge lamp includes an evacuated outer envelope, a domed quartz sleeve therein and an arc tube within the domed quartz sleeve with the arc tube having a pair of electrodes press sealed therethrough with each of the electrodes having a coil thereon spaced from the press seal and from the end of the electrode to provide a figure of merit (FM) substantially equal to the product of the distance from the press seal to the coil and the distance from the press seal to the end of the electrode.






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