The Stern Navigation Signal Light with a 25W specification is an essential component for maritime safety, ensuring that vessels are visible and their orientation is clear to other watercraft after dark. Typically, these lights have a 135-degree visibility range and are designed for vessels measuring 12 meters or more in length. They are constructed from durable materials like aluminum, with transparent color lenses, and are often available in both 12V and 24V configurations to accommodate different boat power systems.