Patent ID: 8288968
Filing Date: 2012-10-16
Classification: H03K,H05B,Y02B

Abstract:
1. A lighting system comprising a plurality of light units, wherein said light units are arranged in an array, wherein light beams of each pair of adjacent light units overlap each other, an ultrasonic transmitter arranged to transmit ultrasonic signals, an ultrasonic receiver arranged to receive reflected ultrasonic signals, a light control device which is arranged to adjust the intensity of each one of said plurality of light units individually, and a processing device arranged to derive a time-of-flight signal representing the time differences between said transmitted and received ultrasonic signals and to send control signals to said light control device in dependence of said time-of-flight signal for adjusting the light intensity of said individual light units, wherein said light control device is further arranged to maintain the total combined luminous flux emitted from said plurality of light units on a predefined imaginary flat surface substantially equal when adjusting the intensity of the individual light units.