Koninklijke Philips Corporation N.V.

Antonius Arnoldus Duisters

Joseph Leonardus Gregorius Suijker

Josephus Christiaan Maria Hendricx

Fransiscus Arnoldus Vermeulen

Hendrik Anton Van Esveld

Vincent Fischer

Johannes Jacobus Franciscus Geijtenbeek

Gerardus Marinus Josephus Franciscus Luijks

Theodorus Gerardus Marinus Maria Kappen

Vital Louis Elisabeth Bruyndoncx

A metal halide lamp includes a discharge vessel surrounded by an outer envelope with clearance and has a ceramic wall which encloses a discharge space filled with a filling comprising an inert gas, such as xenon (Xe), and an ionizable salt. In the discharge space, two electrodes are arranged whose tips have a mutual interspacing so as to define a discharge path between them. The ionizable salt comprises NaI, TlI, CaIand X-iodide wherein X is selected from the group comprising rare earth metals.

Metal halide lamp

Metal halide lamps have a discharge vessel operable at a high coldest spot temperature. The discharge vessel encloses a discharge space comprising an ionizable gas filling and, in addition to Hg, also an alkali iodide of Na of Li or a combination of both. According to the invention, the filling also comprises TbI3 or GdI3 or a combination thereof.

Metal halide lamps are disclosed having a discharge vessel with a ceramic wall. The discharge vessel encloses a discharge space comprising an ionizable gas filling and, in addition to Hg, an alkali iodide of Na or Li or a combination of both. The filling also includes TbI or GdI or a combination thereof.

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Eindhoven, Netherlands

Antonius Arnoldus Duisters