Masthead Light: Hella Marine 3562 Navigation Lights _x0004_are designed for small craft use and are seawater-proof and antimagnetic. The clever part is that bulbs can be changed without tools by simply removing the bayonet top fixing. Black. 63 mm W x 75 mm H x 53 mm D. 12 V/25 W incandescent bulb included. Visibility 2 nm / side nav lights 1 nm.