The nowadays development of thbe narrow low pressure Hg-Ar lamps for LCDpanels backlighting and disinfection purposes reveals a certainlack of experimental and theoretical data on this subject. Special interest from the consideration of the lifetime and radiative power is focused to ectrodeless lamps excited by high frequency discharges. Previously a significant amount of efforts was invested into studying and optimization of the conventional fluorescent light source based on low pressure Hg-Ar discharges. However it appears that for narrower tubes (with inner diameter of apporox 5 mm and less) and scaling and similarity considerations can not be applied automatically. Important information clearifying mechanisms of excitation and giving a basis for optimization for such a lamp can be derived from measurements of the Hg excited states densities.
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