How should you not use your light during a night dive?

You should never shine your light directly into the eyes of other divers or marine life during a night dive. Doing so can momentarily blind or disorient fellow divers and can also interfere with the behavior of marine creatures, potentially altering their natural activities. Proper use of a dive light is essential for safety and to enhance the diving experience without negatively impacting the environment or other divers.

It is appropriate to use your light to illuminate your surroundings, signal other divers, and check your equipment—these are all essential functions of dive lights that promote safety and effective navigation during night diving. Proper light techniques include shining the light downward or away from others to avoid these negative outcomes.