A light source apparatus includes a light source including a first to an n-th light source groups respectively including at least one light emitting diode (LED), a power path controller connected to first ends of the first to the n-th light source groups and configured to selectively provide a driving power to at least one of the first to the n-th light source groups, and a ground path controller connected to second ends of the first to the n-th light source groups and configured to control a path of a current flowing through the light source based on a level of the driving power. The first to the n-th light source groups are sequentially connected to one another, and the second end of the n-th light source group is connected to the first end of the first light source group.