The Stern Navigation Signal Light is a crucial component for maritime safety, ensuring that vessels are visible at night and can communicate their position to other ships. A 15W stern light, such as the CXH4-3P model, typically features a white light installed at the rear of the vessel, around the poop deck area. It serves multiple purposes, including illuminating the ship's stern for activities like mooring, launching lifeboats, or anchoring. These lights are designed to withstand harsh marine conditions, with specifications ensuring visibility, durability, and compliance with international maritime regulations.