Patent ID: 8242715
Filing Date: 2012-08-14
Classification: F21K,F21V,F21Y,H03K

Abstract:
1. A lighting system comprising a plurality of light units, wherein said light units are arranged in at least two groups forming concentric polygons or circles, wherein the light beams of substantially each pair of adjacent light units overlap each other, wherein the light beams of the inner group are directed substantially parallel to each other, wherein the light beams of the light units in the outer group diverge from the light beams of the light units in the inner group, and wherein the lighting system comprises a light control means which is arranged to adjust the intensity of each one of said plurality of light units individually, and wherein the lighting system further comprises an ultrasonic transmitter arranged to transmit ultrasonic signals, an ultrasonic received arranged to receive reflected ultrasonic signals, and a processing means arranged to derive a time-of-flight representing the time differences between said transmitted and received ultrasonic signals and to send control signals to said light control means in dependence of said time-of-flight signal for adapting the light intensity of said individual light units, wherein said ultrasonic transmitter and said ultrasonic receiver are arranged on a rotating means for moving along the circumference of said lights.