The Masthead Navigation Signal Light, with a type designation of CXH3-1D, is a critical component for maritime navigation, particularly for vessels measuring 50 meters or more in length. This light serves as a communication signal during night navigation, ensuring that other vessels can discern the position and orientation of the ship. It operates on a rated voltage of DC 24V, AC 110V, or AC 220V, with a power rating of 60W/65W. The light source is an incandescent lamp, emitting a white color, housed in a B22d lamp holder. It casts a horizontal arc of 225 degrees and a vertical arc of +5 degrees, with a visibility range of 6 nautical miles. The light's protection class is IP55, indicating a high level of protection against dust and water jets. It accommodates a cable with an outside diameter of 10 to 14 mm and is designed to be seat-mounted. The light can operate in a wide range of ambient temperatures, from -30°C to +55°C. The lamp body is constructed of steel, while the lamp shade is made of PC engineering plastic, available in red, green, yellow, or transparent colors, and the entire unit weighs 4.9 kg. This robust design ensures reliable performance under various maritime conditions.