Aquarium controllers typically change the operation of specified aquarium equipment based on things like the time of day or a host of water parameters (pH, conductivity, or temperature for example). Such is the case for the Italy-based Aquatronica controllers as well, but they are adding one more input to their system for even more control options. Their new digital Light Sensor allows the Aquatronica controller to manipulate water pumps, filters, alarms, or any other piece of equipment attached to the system based on whether the lights are on or off. While many of these functions can be driven by time based controls, having the controller physically detect if the lights are off or on makes a huge difference, especially if you want to have certain safeguards in place to protect your valuable aquarium livestock.
Aquarium controllers using time based controls usually work very well. But the drawback to using MORE: Aquatronica Light Sensor Lets You Control Equipment Day or Night