A converter for a lighting control device for controlling lighting comprises: a filter circuit configured to remove a noise component included in an input power; a full-wave rectifier circuit configured to generate a full-wave rectified power from an input power from which a noise component has been removed; a power conversion circuit configured to generate a driving power of lighting by using a full-wave rectified power; and a dimming control circuit configured to output a dimming control signal for adjusting a driving power to the power conversion circuit, according to a dimming level indicating brightness of lighting, wherein the dimming control circuit outputs a first control signal to the full-wave rectifier circuit when the dimming level is less than a first reference value, and in response to the first control signal, the combined capacitance of the full-wave rectifier circuit is reduced, so that total harmonic distortion (THD) is reduced.