The Half Mile iHorn is made from a Half Mile nautical spot light made by Ray Marine Craft. This was probably made in the 1930s to 1940s. The company began as a division of the American company Raytheon, a manufacturer of defense systems, when it launched its first echo depth sounder in 1923. The half mile was aptly named because it would launch a light beam ½ mile. Made for the sailor in you, and as a reminder, that even on dry land we can have a man overboard. So keep the life preserver close, and whenever necessary, cast a light on the subject.