Why should divers limit the use of a single dive light?

Limiting the use of a single dive light is primarily about minimizing risk if that primary light fails. In cavern diving, proper visibility is crucial for safety, and divers rely heavily on their light sources to navigate and see potential hazards in the environment. If a diver has only one light and that light fails, they may find themselves in complete darkness, which can lead to panic, disorientation, and potentially dangerous situations. By using a backup light or having additional light sources, divers can ensure they maintain visibility and control, avoiding any critical issues that could arise from the absence of light. This practice emphasizes risk management and preparedness, key aspects of safe diving in overhead environments like caves or caverns.