Back to  |  Previous paper  |  Next paper

Theoretical Investigation of CMH Lamps Ignition Properties in Ar/Hg Penning Gas Mixtures


Sz. Beleznai1 I. Maros2
1Budapest University of Technology and Economics, Budapest, Hungary
2General Electric Lighting, GE Hungary KFT, Budapest, Hungary


Xe* density spatial evolution during ignition of the CMH lamp

Two-dimensional plasma transport model was developed in COMSOL Multiphysics Plasma Module to investigate fundamental issues in ceramic metal halide (CMH) lamps starting using Ar/Hg penning gas mixture. The intent of this work is to provide insight into possible design rules that might be applied to the improvement of start-up in moderate pressure metal halide lamps. The model gives a complete description of spatial- and time evolution of the discharge plasma. The overall characteristic derived from experimental data has been well described. The results indicate that the Penning effect has a strong influence on the breakdown voltage. At low Hg vapor pressure the results show significant voltage reduction at startup, while large partial pressures of mercury considerably deteriorate discharge ignition efficacy.

Share it on Social Media: