Lighting control system and control method

The utility model provides a lighting control system and a control method. The lighting control system comprises an illumination monitoring module, a control module and an execution unit; the illumination monitoring module is used for measuring illumination; the execution unit has various operating status; and the control module operates input signals and emits control commands to the execution unit to enable the execution unit to switch among the operating status. The control module comprises a storage module for storing an execution threshold value and a closing threshold value; a comparator for comparing input illumination data with the threshold values; an execution arithmetic unit for generating a control command according to an operation result of the comparator and outputting the control command; and a closing threshold value calculating module for reading current illumination data, calculating and generating a new closing threshold value and writing the new closing threshold value into the storage mod