Thallium freeamp;mdash;metal halide lamp with magnesium and cerium halide filling for improved dimming properties

摘要

A thallium-free high pressure ceramic metal halide lamp having superior dimming characteristics with a fill composition comprising MgI₂ and CeI₃. In addition, the fill chemistry comprises NaI and the halides of rare earth metals such as Dy, Ho and Tm.