The CES is a three wire, analog photosensor which provides a light level input into lighting control and building automation systems. The CES has four models used in different locations in and around a building.
Indoor sensors are used in offices and classrooms. Outdoor sensors detect light for sign and site illumination control. Atrium sensors measure light in lobbies. Skylight sensors read the ambient light available in warehouse skylights. Other sensors include a low range indoor model for museum wall monitoring and a high range outdoor sensor for daytime contrast lighting control. Each sensor has a different range and focus of the measured light.