Patent ID: 8456323

Claim:
A lighting-system control method, applied to the lighting-system including a light source and an ultrasonic transmitting-and-receiving device, the lighting-system control method being characterized by comprising steps of: determining a distance between an object and the ultrasonic transmitting-and-receiving device by the ultrasonic transmitting-and-receiving device according to a flight time of an ultrasonic-wave; and changing the light property of the light source when the distance is maintained in a specific range over a specific period, comprising: changing a first light property of the light source and maintained a second light property of light source unchanged when the object is detected moving toward the ultrasonic transmitting-and-receiving device; and changing the second light property of the light source and maintained the first light property of light source unchanged when the object is detected moving away from the ultrasonic transmitting-and-receiving device.