The subject of this paper is the modelling of d.c. and a.c. high-intensity Hg-discharge lamps with differently shaped electrodes. Different arc attachments on the electrodes are studied and insight for the development of new electrodes is gained. The model includes the entire discharge plasma as well as anode and cathode. Using a non-LTE electrical conductivity, no subdivision of the discharge space into different regions is necessary (like space charge layer, ionization zone, plasma column). Modelling results for a 0.6 MPa mercury discharge considering six different electrode shapes are presented and compared with experimental results.
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