HIGH-PRESSURE DISCHARGE LAMP, LAMP UNIT, METHOD FOR PRODUCING HIGH-PRESSURE DISCHARGE LAMP, AND INCANDESCENT LAMP

摘要

A high-pressure discharge lamp (100) comprising an arc tube (10) in which at least a rare gas and a halogen are sealed and which is substantially made of vitreous silica and electrodes (12) disposed in the arc tube (10) and substantially made of tungsten, wherein the mole of the halogen is greater than the sum of the total mole of the metal elements (excluding tungsten and mercury) bondable to the halogen and present in the arc tube (10) and the mole of tungsten evaporated from the electrodes (12) during the operation of the lamp and present in the arc tube (10).