Patent ID: 8575838

Claim:
A ceramic burner for a ceramic metal halide lamp, the ceramic burner comprising: a discharge vessel enclosing a discharge space in a substantially gastight manner and including an ionizable filling comprising one or more halides, the discharge vessel comprising a ceramic wall arranged between a first and a second end portion, the first and the second end portion being arranged such that current supply conductors are passed through the end portions to respective electrodes arranged in the discharge space for maintaining a discharge, the ceramic wall comprising a tube for introducing the ionizable filling into the discharge vessel during manufacture of the ceramic burner, the tube projecting from the ceramic wall and comprising a gastight seal wherein the tube projects from the ceramic wall of the discharge vessel by a predefined distance (h) for limiting material stresses of the ceramic wall to below a predefined level when the gastight seal is being created, wherein the tube has an inner diameter (D 1 ) of between 250 μm and 400 μm and wherein the tube has a wall thickness (D 2 ) of between 150 μm and 250 μm.