| abstract |
Metal halide lamp comprising a discharge vessel surrounded by a separate outer shell and having a ceramic wall that encloses a discharge space filled with a charge comprising an inert gas, such as xenon (Xe), and an ionizable salt , wherein in said discharge space two electrodes are disposed whose tips have a mutual intermediate space so that a discharge circuit is defined, said ionizable salt comprises NaI, TlI, CaI2 and iodide of X, in which X it is at least one rare earth metal characterized in that X is one or more rare earth metals selected from the group Ce, Pr, Nd and because the ratio in molar percentage of iodide of X / (NaI + TlI + CaI2 + iodide of X) It is between 0.5 and 7%, more particularly between 1 and 6%. |