Lopolight 225 Double Masthead Light - 6NM - Silver Housing [300-138]225 Double Masthead Light 6NM Silver Housing The double LED light consists of two (2) individual lights which can be activated separately. One is dedicated as the primary, the other the secondary. The precision machined 6082 aluminum housing with an anodized surface makes the light a rugged and durable housing for the LEDs and electronics contained within. The interior is completely filled with a special potting resin making it water and vibration