Metal halide lamp
AssigneeKoninklijke Philips Electronics N.V.
InventorsJosephus Christiaan Maria Hendricx, Herman Muller, Petrus Antonius Marie Weerdesteijn, Arnoldus Johanna Walravens
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Abstract
The invention relates to a metal halide lamp which is provided with a discharge vessel having a ceramic wall and enclosing a discharge space. Two electrodes having tips at a mutual distance EA are positioned in the discharge space, which contains besides Xe also an ionizable filling with NaI and CeI3. The discharge vessel has an internal diameter Di at least over the length EA. According to the invention it holds that Di<1.4 mm and also that the relation EA/Di<5 is complied with.
Claims9
A metal halide lamp provided with a discharge vessel having a ceramic wall which encloses a discharge space, in which discharge space, which contains Xe and an ionizable filling with NaI and CeI3, two electrodes are arranged whose tips have a mutual interspacing EA, while the discharge vessel has an internal diameter Di at least over the distance EA, characterized in that Di≦2 mm, and the relation EA/Di<5 is complied with.
Dependencies are inferred from the claim text.