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A few underwater lights have a focusing facility by which the beam angle can be adjusted. There are two ways this can be done, depending on the basic emission pattern of the light source. HID lights, which generally produce non-directional light, are usually focused by a reflector, which can be slid longitudinally over the light.
A video light is a powerful light source used primarily for shooting video in environments with insufficient natural light, but can also be used as the primary light source for still photography. Placement of the video light follows the same recommendations as for flash photography, with the advantage that the illumination can be clearly seen ...
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 ...
In many cases brands are limited to certain countries. Not all brands of devices that can take digital images are listed here, including many industrial digital camera brands, some webcam brands, brands of cell phones that feature cameras, and brands of video cameras that can take digital stills. Defunct brands are listed separately.
Even a hand light will help show off some of the magnificent colors of a coral reef or other marine life if used during recording. Modern underwater video lights are now relatively small, have run times of 45–60 minutes and output 600-8000 lumens.
Baited remote underwater video (BRUV) is a system used in marine biology research. By attracting fish into the field of view of a remotely controlled camera, the technique records fish diversity , abundance and behaviour of species.
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