International audienceThe electrical power delivered to the gas in a XeCl Dielectric Barrier Discharge exciplex lamp, is analyzed, applying causality criteria based on an equivalent circuit model of the DBD; this power is shown to be controllable by the current supplied to the lamp. This highly desired property is obtained by means of a specific power supply topology, which concepts and design are discussed. Experimental prototype of a current-mode converter operating in discontinuous current mode around 50 kHz is presented and its capability to control the amount of energy transferred during each current pulse is shown. The capability of this power supply to sustain specific operating conditions for the DBD lamp, with a very stable behavior, (even with a very low current, thus obtaining a single discharge channel) is illustrated. The results concerning the coupling of this converter with a XeCl excilamp are presented and the influence of the supply parameters on the 308nm emission of a Xenon/Chlorine excilamp is analyzed. The shape of the pulsed UV power radiated by the lamp is experimentally shown to be very similar to the one of the current which actually flows into the gas mixture. The UV radiation is demonstrated to be tightly correlated to the current injected into the gas and controllable by means of the available degrees of freedom offered by the control of the power supply. Measurements of the output characteristics and performances of the system are discussed