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's classical searchlight cart.]] of Soviet Union in Estonia .]] Anti-aircraft searchlight]] A searchlight is an apparatus with Reflector s for projecting a powerful beam of Light of approximately parallel rays in a particular direction, usually devised so that it can be swiveled about. Searchlights were first used in World War I to create "artificial moonlight" to enhance opportunities for night attacks, a practice which continued in World War II . Artificial moonlight was invented by historian and Tank Warfare theorist, Gen. J.F.C. Fuller . Searchlights were used extensively in defence against nighttime aerial Bomber raids around the time of World War II . As Radar was a brand-new technology and could only be used for early warning purposes, anti-aircraft Flak guns needed to target visually; searchlights were used to illuminate aircraft in the sky so that the gunners could see them. World War II searchlights include the General Electric 1942-A Searchlight. This was a 60" (152.4 cm) in diameter lamp producing 800,000,000 Candela . It runs off a 15 KW generator and has an effective beam visibility of 28 to 35 miles (45 to 56 km). {Link without Title} More recently, searchlights are often used in Advertising , for instance by Automobile dealers; the beam of light is visible over a large area, and (at least in theory) interested persons can find the dealer or store by following the beam to its source. This also used to be done for Movie Premiere s; the waving searchlight beams are still to be seen as a design element in the logo of the 20th Century Fox Movie Studio . Sources
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