The radiation of a low pressure xenon discharge lamp operated with pulsed discharge has two peaks. The first peak of radiation is mainly radiation of xenon atoms. The radiation of xenon excimers is strong and dominant in the second peak of radiation, i.e. afterglow. For a fluorescent lamps excited by xenon molecular radiations, high efficacy is obtained by pulsed discharge of higher partia1 pressure of xenon. On the other hand, lower partial pressure of xenon is required in order to use xenon atomic resonance.
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