A system comprising: a display device comprising one or more projectors configured to provide first images, viewable by a first visual sensor system in a range of wavelengths viewable by a human being, and second images, viewable by a second visual sensor system comprising night vision device, the first images and the second images having common features which align when the first images and the second images are provided concurrently, first images comprising wavelengths viewable by the second visual sensor system; and, a controller configured to: determine a second visual sensor system intensity component of the first images using a response curve of the second visual sensor system by multiplying the response curve by each spectral radiance curve of each of the first images, and/or each light source of a first projector configured to provide the first images, and summing results of each multiplication; and, reduce intensity of the second images provided at the display device by the second visual sensor system intensity component of the first images, at least when the first images and the second images are concurrently provided; wherein the first images comprise one or more of blue images, green images and red images, and the second images comprise infrared images. a display device comprising one or more projectors configured to provide first images, viewable by a first visual sensor system in a range of wavelengths viewable by a human being, and second images, viewable by a second visual sensor system comprising night vision device, the first images and the second images having common features which align when the first images and the second images are provided concurrently, first images comprising wavelengths viewable by the second visual sensor system; and, a controller configured to: determine a second visual sensor system intensity component of the first images using a response curve of the second visual sensor system by multiplying the response curve by each spectral radiance curve of each of the first images, and/or each light source of a first projector configured to provide the first images, and summing results of each multiplication; and, reduce intensity of the second images provided at the display device by the second visual sensor system intensity component of the first images, at least when the first images and the second images are concurrently provided; wherein the first images comprise one or more of blue images, green images and red images, and the second images comprise infrared images. determine a second visual sensor system intensity component of the first images using a response curve of the second visual sensor system by multiplying the response curve by each spectral radiance curve of each of the first images, and/or each light source of a first projector configured to provide the first images, and summing results of each multiplication; and, reduce intensity of the second images provided at the display device by the second visual sensor system intensity component of the first images, at least when the first images and the second images are concurrently provided; wherein the first images comprise one or more of blue images, green images and red images, and the second images comprise infrared images.