Koninklijke Philips Corporation N.V.

Wouter Edgard Koen Broeckx

Oscar Jan Deurloo

Lukas Leyten

Subramanian Muthu

Willem Van Erk

Roy Hendrik Anna Maria Van Zundert

Oscar Gerard Stappers

Gerlach Corne Pieter Maria Emmen

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.

Metal halide lamp comprising an ionisable salt filling

A method of electronic ballast protection including providing an electronic ballast having an AC/DC converterwith an electronic ballast input and a mains voltage connectionconnectable to a mains voltage, an inverteroperably connected to the AC/DC converterand having an electronic ballast outputconnectable to a lamp, a control circuitcontrolling the inverter, and a low voltage power supplyproviding low voltage power to the control circuit; supplying power to the low voltage power supplyfrom the electronic ballast input when the mains voltage connectionis wired to mains voltage; and disconnecting the power to the low voltage power supplywhen the electronic ballast outputis wired to the mains voltage

Electronic ballast protection

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Eindhoven, Netherlands

Wouter Edgard Koen Broeckx