Unlike lightships in the United States and other parts of the world, Trinity House lightvessels were usually unpowered and needed to be towed to or from their position. In order to act as effective daymarks they were painted red, with the station name in large white letters on the side of the hull, and a system of balls and cones at the masthead for identification. The first revolving light was fitted to the Swin Middle lightvessel in 1837: others used occulting or flashing lights. White lights were preferred for visibility though red and very occasionally green (as with the Mouse lightvessel) were also used.
Unlike lightships in the United States and other parts of the world, Trinity House lightvessels were usually unpowered and needed to be towed to or from their position. In order to act as effective daymarks they were painted red, with the station name in large white letters on the side of the hull, and a system of balls and cones at the masthead for identification. The first revolving light was fitted to the Swin Middle lightvessel in 1837: others used occulting or flashing lights White lights w.ere preferred for visibility though red and very occasionally green (as with the Mouse lightvessel) were also used.