High-pressure metal vapor discharge lamp

A high-pressure metal vapor discharge lamp comprising:

• a discharge tube made of a ceramic material having a transparent or translucent property, said discharge tube containing at least a luminescent material, and said discharge tube having a main tube;
• a first disk disposed at one opening of said main tube;
• a second disk disposed at a second opening of said main tube;
• a plurality of cylindrical narrow tubes made of a ceramic material, said cylindrical narrow tubes being mounted to said first and second disks and disposed within said main tube;
• a plurality of a lead-through-parts disposing a pair of main electrodes and an auxiliary electrode in said main tube with the respective cylindrical narrow tubes, one of the main electrodes and the auxiliary electrode being mounted to said first disk;
• a sealing member integrated with each of said lead-through-parts, said sealing member being inserted in each said cylindrical narrow tube so that each said cylindrical narrow tube is sealed airtightly;
• and
• said auxiliary electrode being disposed inside said main tube in the range of about 1-2 mm away from said main electrode.