Abstract
A large ballast resister is connected to the ground side electrode of our Xe fluorescent lamp with keeping the positive column in diffusive mode. In this configuration the potential of the ground side electrode becomes higher and floating, therefore the current flows out through the stray capacitor between glass wall of the lamp and ground becomes large and not negligible. In this paper we report the effect of ballast resistances ration between hight voltage side and ground side on the optical characteristics of the lamp. As the result, luminous efficacy increased and to maintain the diffuse state became easy by decreasing the ground side resistance. It is necessary to verify this effect by changing the driving frequency and the pulse width in the future.
