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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]
The ADCI was first established in 1968 by a number of small diving companies, contractors and professionals of underwater operations. Officially chartered in 1970, Its goal was to promote industry standards, safety practices, and education within the diving community. [2]
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.
The Diving Certification model originated at Scripps Institution of Oceanography (SIO) in 1952 after two divers died whilst using university-owned equipment. [3] The then President of the University of California, Robert Gordon Sproul, restricted diving to those who had been trained through the program at SIO and thus "certification" was born.
Dive leader is the title of an internationally recognised recreational diving certification for the occupation of "dive guide", which is a specialist underwater application of "tour guide". [ 52 ] [ 53 ] Several other titles are also used, including " Divemaster ".
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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
ISO 11121 introductory training programmes to scuba diving. (PADI equivalent – Discover Scuba Diving) Most PADI training programes are not directly covered by ISO standards. PADI is a member of the following member councils of the World Recreational Scuba Training Council – the RSTC Canada, the RSTC Europe and the C-Card Council (Japan).