Abstract:
An illumination system and method is disclosed. In one example, the illumination system comprises a light source, a controller controlling the power output of the light source, and a light sensor 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 so as to decrease a deviation from a target level, The controller switches from the normal mode to the change mode on the basis of input signals received from the light sensor. The light sensor measures a light level, and decides whether or not to communicate a signal to the controller. The light sensor refrains from transmitting a signal when receiving the signal does not cause the controller to change its control behaviour.
Abstract:
An apparatus comprises a first light sensor configured with a first field of view; and a second light sensor configured with a second, narrower field of view contained within the first field of view. The first and second light sensors may be arranged to detect light reflected from an illuminated surface, wherein the first and second field of view encompass light from an electric lighting device reflected from said surface and additional light reflected from said surface, e.g. natural light; but the second light sensor is concentrated on a region on said surface so as to exclude glare from objects outside said region, whereas the first field of view extends beyond said region. An illumination level of the environment in which the apparatus is installed may be adjusted to compensate for a change in the additional light based on information distinguishing between the two sensors.
Abstract:
An illumination system and method is disclosed. In one example, the illumination system comprises a light source, a controller controlling the power output of the light source, and a light sensor 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 so as to decrease a deviation from a target level, The controller switches from the normal mode to the change mode on the basis of input signals received from the light sensor. The light sensor measures a light level, and decides whether or not to communicate a signal to the controller. The light sensor refrains from transmitting a signal when receiving the signal does not cause the controller to change its control behaviour.