A daylight sensor is a photo-cell detecting device that reads available light in a space and sends a signal to the control system. In a process known as Daylight Harvesting, these sensors takes advantage of naturally available light and dim or completely switch-off the electric lights in a well day-lit space. Daylight sensors are typically used to save energy, provide automatic control, and comply with building codes. Daylight sensors have also been shown to provide between 20%-60% in Light Savings. 

 a. No Sensors: No spaces are equipped to dim/turn off the lights when there is
      sufficient daylight.
 b. Partial Sensors: Around half the building area is equipped with sensors to turn off         the lights when there is sufficient daylight.
 c. Sensors: Whole building area is equipped with daylight sensors to turn off the
      lights when there is sufficient daylight.



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