Koninklijke Philips Corporation N.V.

Oscar Gerard Stappers

Josephus Theodorus Van Der Eyden

Willem Van Erk

Wouter Edgard Koen Broeckx

Jacobus Johannes Franciscus Gerardus Heuts

The invention provides a metal halide lamp having a ceramic discharge vessel, wherein the discharge vessel has a spheroid-like shape with a length Land a largest outer diameter d, the discharge vessel further having curved extremities and openings at the curved extremities which have a curvature r. The discharge vessel has an aspect ratio L/dof 1.1?&#x2266;L/d?&#x2266;2.2 and a shape parameter r/dof 0.7&#x2266;r/d&#x2266;1.1. This lamp has the advantage that it can be operated at a relatively high power. Furthermore, the lamp has a relatively high efficacy. Moreover, the lamp can be operated horizontally and vertically, i.e. it can be qualified for universal burning.

Methal halide lamp comprising a shaped ceramic discharge vessel

The invention provides a metal halide lamp with a ceramic discharge vessel and two electrodes. The discharge vessel encloses a discharge volume containing an ionisable salt filling. The ionisable salt filling comprises 3.5-82 mol % sodium iodide, 0.5-8.5 mol % thallium iodide, 14-92 mol % calcium iodide, 0.5-5.5 mol % cerium iodide and 0.5-3.5 mol % indium iodide. The mol percentages are relative to the total amount of ionisable salt filling. The lamp is dimmable, at least in a range of 50-100% of nominal intensity, while maintaining its light-technical properties and while not substantially deviating from the black body locus. Further, the lamp has a relatively high efficacy. Further, the lamp can be operated horizontally and vertically, i.e. the lamp is suitable for universal burning.

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Eindhoven, Netherlands

Oscar Gerard Stappers