An intelligent system for controlling an exterior landscape lighting system by self calibration and self adjustments in real-time includes a plurality of lighting units, each lighting unit comprising a light sensor, a clocking device is electrically connected to each lighting unit, a power supply means operable to provide electrical power for operation of the clocking device, and a controller unit comprising a memory for storing a pre-recorded historical data and executing a set of instructions to control on and off times of each lighting unit.