Patent ID: 8564200
Filing Date: 2013-10-22
Classification: H01J

Abstract:
1. A metal halide lamp ( 1 ) comprising a ceramic discharge vessel ( 3 ), which discharge vessel ( 3 ) encloses a discharge volume ( 11 ), comprises two electrodes ( 4 , 5 ), and contains an ionizable gas filling, the ionizable gas filling comprising one or more components selected from the group consisting of LiI, NaI, KI, RbI, CsI, MgI 2 , CaI 2 , SrI 2 , BaI2, ScI 3 , YI 3 , LaI 3 , CeI 3 , PrI 3 , NdI 3 , SmI 2 , EuI 2 , GdI 3 , TbI 3 , DyI 3 , HoI 3 , ErI 3 , TmI 3 , YbI 2 , LuI 3 , InI, TlI, SnI 2 and ZnI 2 , wherein the concentration h of the respective components in the discharge vessel ( 3 ) in μg/cm 3 fulfill the equation: wherein T cs is the coldest spot temperature of discharge vessel ( 3 ) in Kelvin during nominal operation of the lamp ( 1 ), wherein A, B and C are defined as follows: and wherein T