Daylighting control

Daylighting control
  A control system that varies the light output of an electric lighting system in response to variations in available daylight.
  California Energy Comission. Dictionary of Energy Terms
  ***
  A system of sensors that assesses the amount of daylight and controls lighting or shading devices to maintain a specified lighting level. The sensors are sometimes referred to as "photocells."

Energy terms . 2014.

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