Ceramic metal halide discharge lamp with NaI/CeI.sub.3 filling
AssigneeU.S. Philips Corporation
InventorsJohannes A. J. M. Van Vliet, Johannes J. F. Geijtenbeek
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Abstract
Metal halide lamp with ceramic discharge vessel having electrodes with spacing EA, internal diameter Di, and EA/Di>5. Ionizable filling comprises NaI and CeI.sub.3, and a coldest spot temperature of 1100-1500 K is achieved.
Claims5
A metal halide lamp comprising a discharge vessel with a ceramic wall which encloses a discharge space in which an ionizable filling is present, two electrodes having tips with and mutual distance EA being arranged in said discharge space, the discharge space having an internal diameter Di at least over the distance EA, wherein the ionizable filling comnprises, NaI and CeI.sub.3 and EA/Di>5.
Dependencies are inferred from the claim text.