Metal-halide lamp with lithium and cerium iodide
AssigneeU.S. Philips Corporation
InventorsJohannes J. F. Geijtenbeek, Fransiscus A. Vermeulen
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Abstract
Metal halide lamp includes a discharge vessel having a ceramic wall with an internal diameter Di and enclosing two electrodes whose tips are a distance EA apart, wherein EA/Di>5. The vessel has a filling comprising Hg, CeI, and LiI.
Claims7
A metal-halide lamp comprising a discharge vessel with a ceramic wall which encloses a discharge space with an ionizable filling including at least Hg, an alkali halide and CeI.sub.3, and which discharge space further accommodates two electrodes whose tips are arranged at a mutual distance EA, and the discharge vessel has an inside diameter Di at least over the distance EA, and the relation EA/Di>5 is met, characterized in that the alkali halide comprises LiI.
Dependencies are inferred from the claim text.