Port navigation signal lights are essential for the safety and regulation of maritime traffic, particularly during night navigation or in poor visibility conditions. A red port light indicates the left side of a vessel as seen from another ship or from the water, guiding the way through the darkness. These lights are designed to be highly visible, often with a visibility range of 2 nautical miles and an arc of 112.5 degrees to ensure they cover a wide area for signaling purposes. For vessels over 50 meters in length, a red port navigation signal light with a power rating of 60W is a common specification, providing a reliable and energy-efficient source of illumination.