(19)
(11) EP 0 359 200 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.05.1991 Bulletin 1991/19

(43) Date of publication A2:
21.03.1990 Bulletin 1990/12

(21) Application number: 89116864.3

(22) Date of filing: 12.09.1989
(51) International Patent Classification (IPC)5: H01J 61/34, H01J 61/82
(84) Designated Contracting States:
BE DE FR GB NL

(30) Priority: 12.09.1988 US 243370

(71) Applicant: GTE PRODUCTS CORPORATION
Wilmington Delaware 19801 (US)

(72) Inventors:
  • Krasko, Zeya K.
    Beverly, MA 01915 (US)
  • Keeffe, William M.
    Rockport, MA 01966 (US)

(74) Representative: Leckey, David Herbert 
Frank B. Dehn & Co., Imperial House, 15-19 Kingsway
London WC2B 6UZ
London WC2B 6UZ (GB)


(56) References cited: : 
   
       


    (54) Metal halide discharge lamp with improved color rendering properties


    (57) A low wattage metal halide lamp having improved CRI is disclosed. The low wattage metal halide discharge lamp of the present invention comprises an outer sealed glass envelope; a pair of electrical conductors sealed into and passing through the glass envelope; an arc tube disposed within the outer glass envelope, the arc tube including a pair of spaced electrodes therein with the electrodes being electrically connected to the electrical conductors such that one electrode is electrically connected to one electrical conductor; a chemical fill disposed within the arc tube, the chemical fill comprising mercury, scandium metal, sodium iodide, scandium iodide, lithium iodide, and a starting gas; and a support structure disposed within the outer glass envelope to support the arc tube therein, the support structure (12) being electrically isolated from the electrical circuit of the lamp.






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