Obstruction markers for air navigation (fixed obstacles) according to ICAO standards. Also suitable for any kind of industrial signaling application. Standard colour red, other colours on request (blue-yellow-green-colourless). Models for mains voltage incandescent lamps, E27 socket, normal or long life type (8000 hours) maximum power 75W. Available in single and double version with separate automatic stand-by lamp change-over device (CMA). On complex structures comprising several units, it is recommended to use the QL control panels piloting groups of markers.