Patent ID: 6831414
Filing Date: 2004-12-14
Classification: H01J

Abstract:
A high-pressure gas discharge lamp comprising:a quartz glass lamp vessel with a space which is enclosed in a gastight manner by a wall, said wall comprising mutually opposed seals and an inner surface; a pair of electrodes arranged opposite to one another in said space, each electrode comprising a tip and an electrode rod, and each electrode being connected to a respective current lead-through which extends through a respective seal to the exterior; an outer surface of the wall extending between the seals, the wall having a wall load of at least 30 W/cm2 at its outer surface during stable lamp operation; a filling inside the space comprising a rare gas and halides of tin and indium, said filling comprising an alkali halide with at least one alkali ion and at least one halide ion, said alkali ion being chosen from the group formed by potassium, rubidium, and cesium, and said halide ion being chosen from the group formed by chlorine, bromine, and iodine, wherein the electrode rod of at least one of the electrodes is provided with spacer means at the area of the inner surface of the wall, whereby a capillary opening is realized which surrounds the electrode rod and is present between the electrode rod and the spacer means.