How should divers position their lights when exploring underwater?

Pointing lights slightly downward when diving minimizes backscatter, which is the reflection of light off particles suspended in the water. Backscatter can significantly degrade visibility and create distractions by illuminating particulates in the water, making it challenging to see clearly. By angling the lights downwards, divers reduce the likelihood of encountering backscatter, allowing for a clearer view of the underwater environment and improving overall visibility.

This approach is especially important in limited visibility conditions, where water clarity can be compromised by sediment or plankton. In contrast, pointing lights straight ahead might seem like a viable option for visibility, but it can lead to significant backscatter that obstructs sightlines. Pointing lights upward may attract marine life, but it does not facilitate a clear view of the diving environment and can contribute to disorientation. Keeping lights turned off is not practical, as adequate lighting is essential for safety and exploration in underwater settings.