Which lights are used on tanker aircraft for visual reference?

Tanker lights are specifically designed for use on tanker aircraft to enhance visual identification and ensure safe operations, particularly during the process of air refueling. These lights help other aircraft or aircrews visually reference the tanker in various flying conditions and situations. They typically consist of bright, highly visible lights that can be activated to convey the tanker’s presence, aiding in communication and coordination with receiving aircraft.

Formation lights, while also useful for visual reference in flight, serve a different purpose, mainly for aircraft flying in close proximity to one another. Strobe lights are primarily for enhancing visibility to other aircraft and not specifically tailored for the tanker operation context. Navigation lights are used to show the aircraft's orientation and direction but do not offer the specialized visual reference needed for the unique mission of a tanker aircraft. Hence, tanker lights are the appropriate choice for visual reference in this specific operational scenario.