Searchlights were first used in the military in the 19th century, and they were commonly found in coastal artillery positions and air defense forces.
During Second World War, searchlights were used extensively in night air raids against the enemy. Specially German Army used them to search the Enemy Bomber Aircrafts.
According Wikipedia Definition searchlight is:
A Searchlight (or Spotlight) is an apparatus that combines an extremely bright source (traditionally a carbon arc lamp) with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a particular direction. It is usually constructed so that it can be swiveled about.
