The light source device includes a plurality of semiconductor light sources for emitting lights in different wavelength bands, a current value and a duty of a driving signal for driving one reference semiconductor light source among the plurality of semiconductor light sources based on the brightness control information Determining a current value of a driving signal for driving a semiconductor light source other than the reference semiconductor light source among the plurality of color semiconductor light sources based on a current value of a driving signal for driving the reference semiconductor light source, Determining a duty ratio of a drive signal for driving a semiconductor light source other than the reference semiconductor light source among the plurality of color semiconductor light sources to match a duty ratio of a drive signal for driving the reference semiconductor light source, A control unit that generates light control information for dimming control of the light source and a driving unit that drives the semiconductor light sources of the plurality of colors based on the light control information.光源装置は、互いに異なる波長帯域の光を出射する複数の半導体光源と、明るさ制御情報に基づいて前記複数色の半導体光源のうちの1つの基準半導体光源を駆動する駆動信号の電流値及びデューティ比を決定し、前記複数色の半導体光源のうちの前記基準半導体光源以外の半導体光源を駆動する駆動信号の電流値を前記基準半導体光源を駆動する駆動信号の電流値に基づいて決定し、前記複数色の半導体光源のうちの前記基準半導体光源以外の半導体光源を駆動する駆動信号のデューティ比を前記基準半導体光源を駆動する駆動信号のデューティ比に一致させるよう決定して、前記複数色の半導体光源を調光制御するための調光情報を発生する制御部と、前記調光情報に基づいて前記複数色の半導体光源を駆動する駆動部とを具備する。
