Gte Sylvania Incorporated

Gte Products Corporation

Frederic Koury

William M Keeffe

W Calvin Gungle

An electrode for a metal halide arc discharge lamp comprises a coiled coil on a tungsten rod, the rod diameter being equal to W.sup.0.56 /0.784 mils, where W is the input power to the lamp in watts. The primary wire for the coiled coil equals D.sup.1.8 /80.8, where D is the rod diameter in mils, and is equal to half the diameter of the mandrel wire of the coiled coil.

Metal halide arc discharge lamp having coiled coil electrodes

The emitter material on the electrode of a high intensity discharge lamp comprises hafnium oxide, barium oxide and calcium oxide.

High pressure mercury vapor discharge lamp having improved electrodes

A thin foil of hafnium or a hafnium alloy is disposed within a high pressure metal halide discharge lamp for selectively gettering any hydrogen contaminant within the lamp. In one embodiment a long strip of hafnium foil is welded along the current return wire which extends from the remote end of the arc tube to the base of the lamp, while in another embodiment, bowed-out strips are welded to support straps on each of the arc tube press seals. In this manner, a significant portion of the hafnium getter is disposed in a location where it is subjected to operating temperatures lower than about 330.degree.C.

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Alexandria, NH, United States of America

Frederic Koury