A light regulating system comprising: - a rail, in use extending in horizontal direction; - a plurality of lamellae, in use extending in vertical direction; - lamellae support members to support the plurality of lamellae, wherein the lamellae support members are movably connected to the rail allowing to move the lamellae support members along the rail parallel to a longitudinal axis of the rail between an open position in which the lamellae support members are stacked together and a closed position in which the lamellae support members are distributed substantially evenly along the rail, and wherein each lamellae support member is attached to a corresponding lamella such that the respective lamella can rotate relative to the rail about a rotation axis extending parallel to a longitudinal axis of the lamella; - a lamellae rotating actuator system configured to rotate the lamellae about their respective rotation axes; - a measurement system configured to measure an actual angular orientation of the lamellae about their respective rotation axes; - a detector configured to detect whether or not the lamellae support members are in the closed position; - a control unit configured to drive the lamellae rotating actuator system based on a comparison of the actual angular orientation of the lamellae as measured by the measurement system and a desired angular orientation of the lamellae as determined by the control unit based on a position and/or intensity of the sun; characterized in that an operating member is connected to the lamellae rotating actuator system to allow rotation of the lamellae about their respective rotation axes by manual operation of the operating member; in that the detector and the measurement system are connected to the control unit; in that the control unit comprises a main automatic mode in which the control unit is configured to autonomously drive the lamellae rotating actuator system, and in that the control unit is configured to operate in the main automatic mode provided that the detector indicates that the lamellae support members are in the closed position and there is no indication from the measurement system that the lamellae have been rotated manually since the lamellae support members have been positioned in the closed position. - a rail, in use extending in horizontal direction; - a plurality of lamellae, in use extending in vertical direction; - lamellae support members to support the plurality of lamellae, wherein the lamellae support members are movably connected to the rail allowing to move the lamellae support members along the rail parallel to a longitudinal axis of the rail between an open position in which the lamellae support members are stacked together and a closed position in which the lamellae support members are distributed substantially evenly along the rail, and wherein each lamellae support member is attached to a corresponding lamella such that the respective lamella can rotate relative to the rail about a rotation axis extending parallel to a longitudinal axis of the lamella; - a lamellae rotating actuator system configured to rotate the lamellae about their respective rotation axes; - a measurement system configured to measure an actual angular orientation of the lamellae about their respective rotation axes; - a detector configured to detect whether or not the lamellae support members are in the closed position; - a control unit configured to drive the lamellae rotating actuator system based on a comparison of the actual angular orientation of the lamellae as measured by the measurement system and a desired angular orientation of the lamellae as determined by the control unit based on a position and/or intensity of the sun; in that the detector and the measurement system are connected to the control unit; in that the control unit comprises a main automatic mode in which the control unit is configured to autonomously drive the lamellae rotating actuator system, and in that the control unit is configured to operate in the main automatic mode provided that the detector indicates that the lamellae support members are in the closed position and there is no indication from the measurement system that the lamellae have been rotated manually since the lamellae support members have been positioned in the closed position.