Lighting control device

A lighting control device that controls a lighting device via feedback control and demand control which is executable in parallel with the feedback control, the lighting control device comprising:

• a brightness sensor that obtains brightness information indicating a current brightness of an illuminated surface illuminated by the lighting device;
• a storage that stores a brightness target value for the illuminated surface;
• a controller that obtains the brightness information from the brightness sensor and the brightness target value from the storage;
• a receiver via which the controller receives, from an external source, an energy-saving signal instructing execution of energy-saving light emission by the lighting device, for the demand control of the lighting device;
• and
• a transmitter that transmits, to the lighting device, a control signal generated by the controller for controlling the lighting device, wherein:
• when the energy-saving signal is not being received, to execute the feedback control, the controller repeatedly and continuously determines a dimming rate for the lighting device based on the brightness target value obtained from the storage and the brightness information, and transmits, to the lighting device via the transmitter, the control signal indicating the dimming rate, and
• when the energy-saving signal is being received, to execute the demand control, the controller determines an energy-saving brightness target value by multiplying the brightness target value obtained from the storage by a predetermined rate and repeatedly and continuously determines an energy-saving dimming rate for the lighting device based on the energy-saving brightness target value and the brightness information, the energy-saving brightness target value being smaller than the brightness target value obtained from the storage, and transmits, to the lighting device via the transmitter, the control signal indicating the energy-saving dimming rate.