Basic lighting
As depth increases, water absorbs light (especially the red and yellow spectrum), causing the environment to darken. A diving light provides artificial light to help divers see their surroundings. In areas of low visibility (such as rivers, lakes, or offshore), the light can penetrate suspended particles and improve vision clarity.
Safety and signaling
Positioning and communication:
Flashing light patterns (such as SOS) can be used for emergency help.In areas with poor visibility, the light helps buddies or boats identify the diver's position
Warning: remind passing boats or divers to avoid (especially in night dives or cave dives).
Exploration and observation
Light up caves, shipwrecks or cracks in coral reefs to discover hidden marine life (such as octopuses, shrimps and crabs, etc.). Many marine creatures are active at night, and lights can help observe their behavior (such as coral spawning, nocturnal fish)
Underwater photography and videography
To make up for the lack of natural light and restore the true color of the subject (requires lighting with high color rendering index CRI ≥ 90), side lighting, back lighting and other techniques can enhance the layering of the photo. Continuous and uniform light is suitable for shooting dynamic pictures (requires floodlight or dual-light configuration).
For technical diving only
Cave/wreck diving:
Narrow beam (spotlight) for long-distance path exploration.
Backup light is necessary to prevent disorientation due to failure of the main light.
Deep diving: High brightness light penetrates the deep darkness to assist navigation and instrument readings.
Entertainment and Experience
Fluo Diving: Use blue or ultraviolet light to stimulate the fluorescent reaction of some marine organisms, creating a magical visual effect.
Interactive Experience: Lights can attract fish (be careful to avoid direct strong light on sensitive organisms).
Notes
Ecological protection: Avoid strong light directly hitting corals or fish, which may interfere with their physiological rhythms.
Cooperation with diving partners: Light signals must be agreed upon in advance (such as shaking for attention and drawing a circle for help).
Visibility and beam selection: Use narrow beams to reduce reflections in turbid waters and floodlights to expand vision in clear waters.
