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dive light
A dive light is a light source carried by an underwater diver to illuminate the underwater environment. Scuba divers generally carry self-contained lights, but surface supplied divers may carry lights powered by cable supply from the surface.
A dive light is routinely used during night dives and cave dives, when there is little or no natural light, but also has a useful function during the day, as water absorbs the longer (red) wavelengths first then the yellow and green with increasing depth. By using artificial light, it is possible to view an object in full color at greater depths.
==Need==
Water is responsible for the attenuation of light due to absorption so use of a dive light will improve a divers underwater vision. As we go deeper on a dive, more color is absorbed by the water. Color vision is also affected by turbidity of the water as well as particulate matter.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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