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In medical instruments such as the endoscope, highly efficient and optically stable lamps are needed to guarantee precise work and achieve great results. The color rendering should be as close as possible to the natural sunlight so that organs, blood vessels etc. can be well distinguished. To fulfill these requirements, USHIO has developed xenon short-arc lamps that have an emission spectrum similar to the sun with an integrated reflector that allows efficient radiation coupling into an optical fiber. Furthermore, the lamps are highly stable to prevent the occurrence of visual artifacts.