C7057 cadmium sulfide photocells are used to sense ambient light levels. They are used as the sensing element for the CR7075A lighting controller, which can provide on-off control for two separate lighting banks.

CR7075A 2-stage lighting controllers offer on-off sequenced control of two separate lighting banks based on user determined light intensity levels.

The R718G device has a built-in light sensor that can be used for ambient light intensity detection.