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The use of the electrodeless fluorescent lamps has been increasing, because of their features such as lifetime and lumen efficiency, when compared to conventional fluorescent and high pressure sodium lamps. The single-stage high-power-factor electronic ballast for electrodeless fluorescent lamp with dimming feature is presented on this paper. It is obtained by integrating a SEPIC converter with a Half-Bridge asymmetric LCC resonant inverter, which can effectively regulate the lamp power. Experimental results are shown, in order to validate the proposed idea. The implemented topology presented a power factor of about 0.995, a total current harmonic distortion of 9.61% and an efficiency of 86%.