Sensor unit for determining control information for use in daylight-dependent light control, comprising: - an image sensor for acquiring digital image information, as well as - a controller for evaluating the image information generating a brightness signal that is representative of daylight, wherein • upon generation of the brightness signal, the controller is designed to take greater account of image areas of the image information acquired by the image sensor, which are influenced more strongly by daylight by means of weighting factors, • the controller is designed to independently detect image areas which are influenced more strongly by the daylight, • for generating the brightness signal, brightness information, in particular brightness values, of individual image areas are multiplied by a respective weighting factor, and the controller is designed to independently determine the weighting factors for the image areas in the context of an optimization algorithm, and wherein the brightness information of two images recorded in chronological succession is mutually compared in the context of the optimization algorithm, characterized in that the controller causes i) the weighting factor associated with an image area a) to increase if the temporal change in the brightness information of this image area is similar to the temporal change in the overall brightness of the image, b) to decrease if the temporal change in the brightness information of this image area is not similar to the temporal change in the overall brightness of the image, or causes ii) the weighting factor associated with an image area a) to increase if the brightness information of this image area is not similar to the temporal change in the overall brightness of the image, b) to decrease if the brightness information of this image area is similar to the temporal change in the overall brightness of the image. - an image sensor for acquiring digital image information, as well as - a controller for evaluating the image information generating a brightness signal that is representative of daylight, • upon generation of the brightness signal, the controller is designed to take greater account of image areas of the image information acquired by the image sensor, which are influenced more strongly by daylight by means of weighting factors, • the controller is designed to independently detect image areas which are influenced more strongly by the daylight, • for generating the brightness signal, brightness information, in particular brightness values, of individual image areas are multiplied by a respective weighting factor, and the controller is designed to independently determine the weighting factors for the image areas in the context of an optimization algorithm, i) the weighting factor associated with an image area a) to increase if the temporal change in the brightness information of this image area is similar to the temporal change in the overall brightness of the image, b) to decrease if the temporal change in the brightness information of this image area is not similar to the temporal change in the overall brightness of the image, or causes a) to increase if the temporal change in the brightness information of this image area is similar to the temporal change in the overall brightness of the image, b) to decrease if the temporal change in the brightness information of this image area is not similar to the temporal change in the overall brightness of the image, ii) the weighting factor associated with an image area a) to increase if the brightness information of this image area is not similar to the temporal change in the overall brightness of the image, b) to decrease if the brightness information of this image area is similar to the temporal change in the overall brightness of the image. a) to increase if the brightness information of this image area is not similar to the temporal change in the overall brightness of the image, b) to decrease if the brightness information of this image area is similar to the temporal change in the overall brightness of the image.