Koninklijke Philips Corporation N.V.

Jacobus Johannes Franciscus Gerardus Heuts

Josephus Theodorus Van Der Eyden

Oscar Gerard Stappers

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.

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Turnhout, Belgium

Jacobus Johannes Franciscus Gerardus Heuts