Abstract: A light tracking sensor for mounting on, for example, a solar collector; provides control signals which are employed with a drive mechanism for a tracking device to direct the collector toward the sun. The sensor includes a mounting base with a plurality of first light detectors mounted in spaced relationship on the base for receiving incident sunlight. An adjustable shade is mounted to the base for selectively shading light directed toward the detectors and a target is positioned on the base between the light detectors and includes elongated recesses each with a recessed additional light detector. The first light detectors initiate operation of the light tracking device in a direction to orient the target toward the light source and the recessed light detectors terminate operation of the light tracking device once the target is directed toward the light source.