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Underwater digital cameras are used to capture the beautiful life beneath the ocean. The cameras help scientists in their research on marine biology and wealth. There are many branded companies that offer high- quality digital underwater cameras. A few of the famous companies are Canon, Kodak, Sony, Nikon and Olympus. The best underwater digital cameras are those that can be used for sporting or scientific activities, in all kind of weather and in a variety of locations, wet or wild.

The first ARC lamps were developed in’09 by Sir Humphrey Davy. These lamps were carbonic arch lamps functioning with one carbon baguettes fixed at each of the two polls of a battery and creating through their touch a white incandescent light. If these baguettes were separated and put at a distance of 10 cm they would create a luminous strong white light arch. These principal is what stays at the base of the projector lamps present nowadays.