A clip-on light source is provided that is suited for use with medical instruments. The device comprises a light source housing that is rotatably affixed to a spring biased clip. The clip includes an upper clip member and a lower clip member that are hinged and spring biased together. The upper clip member is rotatably affixed to the lower surface of the housing such that the housing can rotate relative to the clip once the clip is affixed to a support surface. The housing comprises a frontal portion, an upper portion, and an interior volume, whereby the interior volume supports a circuit board, a battery power supply, and the light source. The light source projects through an upper surface projection along the housing, whereby the light is directed along the upper surface of the housing and towards the frontal portion.
