Koninklijke Philips Corporation N.v.

Walter Schlager

Xaver Riederer

Ghaleb Natour

The high-pressure discharge lamp comprises a lamp vessel ( ) in which an anode ( ) and a cathode ( ) are disposed spaced apart by an electrode distance D of 1-2 mm, the anode ( ) having a tip ( ) with a blunt end surface S. The area of the end surface S in mm and the lamp current I in amperes satisfy a relationship according to which 0.09&lE;S/I&lE;0.16, with 3.5&lE;I&lE;8.0 amperes. The ionizable filling containing metal halide comprises an amount of mercury between 65-125 mg/cm . The power range of the lamp is between 200 and 400 watts. The calculated power gap ratio, PGR&equals;P/D, is over 120 W/mm. The lamp is suitable for comparatively high brightness applications and at the same time is comparatively stable and has a comparatively long life.

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Bocholtz, Netherlands

Walter Schlager