ILLUMINATION SYSTEM WITH AUTOMATIC ADAPTATION TO DAYLIGHT LEVEL

摘要

An illumination system (10) comprises: -a light source (11); -a controller (12) controlling the power output of the light source; -a light sensor (16) wirelessly communicating with the controller. In a normal mode, the controller controls the light source such that the light level remains substantially constant. In a change mode, the controller controls the light source such that the light level is gradually changed with a predetermined change rate (R) such as to decrease a deviation from a target level (LT). The controller switches from its normalmode to its change mode on the basis of input signals received from the light sensor. The light sensor measures a light level, and decides whether or notto communicate a signalto the controller. The light sensor refrains from transmitting a signal when receiving the signal will not cause the controller to change its control behaviour.