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A modern dive light usually has an output of at least about 100 lumens. Bright dive lights have values from about 2500 lumens. Halogen lamps provide this light at over 50W power consumption. High-intensity discharge lamps (HID) [6] and Light-emitting diodes (LED) can provide similar output for less power. [8]
Underwater photography is the process of taking photographs while under water. It is usually done while scuba diving, but can be done while diving on surface supply, snorkeling, swimming, from a submersible or remotely operated underwater vehicle, or from automated cameras lowered from the surface.
Normal requirements for night diving are a dive light, and adequate protection from exposure. [1] Some precautions and skills for night diving include: avoiding shining the light in other divers' eyes, to be aware of and use surface light signals for bearings, and if appropriate to use an illuminated shotline buoy. [1]
Scuba diver with bifocal lenses fitted to a mask. Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors.. Underwater, objects are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through
Navigation is a common activity during dives. Diver navigation, termed "underwater navigation" by scuba divers, [16] is a set of techniques—including observing natural features, the use of a compass, and surface observations—that divers use to navigate underwater.
This is a photo of John Lewis being arrested in Tennessee for organizing and demonstrating during the Civil Rights movement, 1961. In the same year, at age 21, Lewis was attacked by two ...