This article describes the major development results of the first Russian sample of a UHP xenon discharge lamp with sapphire envelope. The article proposes a method of monitoring of thermal fields of semi-transparent materials and studies the thermal distribution of quartz and sapphire envelopes of UHP discharge lamps. Mechanical strength of sapphire tubes depending on the temperature is studied, the thickness of the discharge envelope wall is calculated, and distinctions of the design of a UHP xenon lamp with the sapphire envelope are considered. 1. Basov Yu.G., Rakviashvili A.G., Sysun V.V. Spetsialnaia svetotekhnika [Special Light Engineering] // BSU, Minsk, 2008, 414 p.
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• discharge lamp
• UHP discharge
• quartz and sapphire envelope
• xenon
• mechanical strength
• thermal distribution
• thermal field of a bulb