Metal halide discharge lamp with improved color rendering proper

Details Metal halide discharge lamp with improved color rendering proper Metal halide discharge lamp with improved color rendering proper

1991-04-04

1991-10-15

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

313641, H01J 1720, H01J 6120

Patent

active

050577433

ABSTRACT:
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 being electrically isolated from the electrical circuit of the lamp.

REFERENCES:
patent: 3979624 (1976-09-01), Liu et al.
patent: 4053805 (1977-10-01), Scholz
patent: 4247798 (1981-01-01), Howe et al.
patent: 4709184 (1987-11-01), Keeffe et al.
patent: 4766348 (1988-08-01), Englishe et al.
European Pat. Appln. 0 173 235, Keeffe et al., "Low Wattage Metal Halide Lamp", pub. Mar. 5, 1986.
European Pat. Appln. 0 134 426, George J. English, "Single-Ended Metal Halide Discharge Lamp With Minimal Colour Separation", pub. Mar. 20, 1985.
European Pat. Appln. 0 210 626, Gilbert H. Reiling, "Metallic Halide Electric Discharge Lamps", pub. Feb. 4, 1987.

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