When the translucent ceramics is used as the material of the light-emitting tube, it is possible to secure the coldest part and obtain a light-emitting tube having a long life.;A starting auxiliary electric-charge body 15 is installed in the arc tube main body 10 in which the discharge medium and the rotating gas are sealed in the discharge space 11 and the flow-coupled discharge is wound into the arc tube main body 10 by winding the arc tube (10) is made of translucent ceramics, and the tubular portion (14) is integrally formed in the main body (10) of the arc tube And a starter auxiliary conductive substance body 15 is inserted into the tubular portion 14. The stopper 15 is inserted into the opening 14a of the tubular portion 14 through a glass adhesive 20 Respectively.
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