Number of Zones - This refers to the number of rooms that the controller allows you to monitor or control.

Photocell - is a feature of some lighting controllers and timers that will allow equipment to be activated based on daytime or nighttime periods. This is helpful for turning off exhaust fans for your air-cooled lighting during the lights off period. Another example would be when using CO2 in your grow room, use a controller with a photocell sensor that will turn off your CO2 devices during the lights off period because plants do not use CO2 at night.

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