Pendeen Lighthouse, Cornwall The Pendeen Lighthouse is a circular white tower, 56 feet in height , near the Pendeen Watch House. The source of light is actualy 190 feet above sea level and can be seen from a distance of nearly 20 miles.The light is given in four flashes of a quarter of a second duraton and shown in groups with a two second duration. between each group the light is eclipsed for eight seconds.