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2. Dive light - Wikipedia

   en.wikipedia.org/wiki/Dive_light

   Water attenuates light by absorption, so use of a dive light will improve a diver's underwater vision at depth. [1] As the depth increases, more light is absorbed by the water. Color absorption depends on the purity of the water - pure water is most transparent to blue frequencies, but impurities may reduce this significantly.

3. Fishing light attractor - Wikipedia

   en.wikipedia.org/wiki/Fishing_light_attractor

   Fish are most attracted to true-green light colors, and LEDs do the best job of illuminating this color. A fishing light attractor is a fishing aid that uses lights attached to structures above water or suspended underwater to attract fish and members of their food chain. Fish are typically most attracted to true-green light colors.

4. Fishing techniques - Wikipedia

   en.wikipedia.org/wiki/Fishing_techniques

   Fishing light attractors - use lights attached (above or underwater) to some structure to attract fish and bait fish. Fishing light attractor are operated every night. After a while, fish discover the increased concentration of bait surrounding the light. Once located, the fish return regularly, and can be harvested.

5. Glow stick - Wikipedia

   en.wikipedia.org/wiki/Glow_stick

   A glow stick, also known as a light stick, chem light, light wand, light rod, and rave light, is a self-contained, short-term light-source. It consists of a translucent plastic tube containing isolated substances that, when combined, make light through chemiluminescence. The light cannot be turned off and can be used only once.

6. Magnesium torch - Wikipedia

   en.wikipedia.org/wiki/Magnesium_torch

   A magnesium torch is a bright light source made from magnesium, which can burn underwater and in all weather conditions. They are used for emergency illumination for railroad applications. They were also used in the 1950s up to the early 1970s as a light source for scuba diving, and were featured occasionally in television shows. A relay of ...

7. List of diving hazards and precautions - Wikipedia

   en.wikipedia.org/wiki/List_of_diving_hazards_and...

   A dive light can provide light if the visibility is sufficient. In zero visibility special precautions must be taken. It is usually preferable to use surface-supplied equipment with voice communications, as the diver can not get lost, and the surface team can monitor depth, time, breathing gas and decompression obligations.