Why should divers avoid using flashlights with a strong beam during night dives?

Using a flashlight with a strong beam during night dives can cause temporary blindness or disorientation in other divers. This is particularly important in a team diving scenario where visibility is critical for safety and communication. A wide or strong beam may inadvertently shine into the eyes of a fellow diver, creating a blinding effect that can impair their vision and awareness of their surroundings.

Maintaining clear visibility and awareness is essential for the safety of all divers, especially in low-light conditions where spotting potential hazards or navigating can already be challenging. Therefore, divers are often advised to use torches that provide a softer, focused beam for better control over where the light is directed, thus ensuring the comfort and safety of everyone in the dive group. Furthermore, being considerate of light usage helps in preserving the natural behavior of marine life, as strong beams can startle and drive them away, contradicting the serene experience of night diving.