Searchlight
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.
For other uses, see Searchlight (disambiguation).
Tribute in Light, representing the World Trade Center twin towers in remembrance of the September 11 attacks
Today, searchlights are used in advertising, fairs, festivals and other public events. Their use was once common for movie premieres; the waving searchlight beams can still be seen as a design element in the logos of 20th Century Studios and the Fox television network. The world's most powerful searchlight today beams from the top of the pyramid-shaped Luxor Hotel in Las Vegas. It concentrates about 13,650,000 lumens from 39 7kW xenon lamps into a beam of about 9,129,000,000 candela.
Tribute in Light is an art installation that uses two columns of searchlights to represent the former Twin Towers of the World Trade Center, in remembrance of the September 11 attacks. It is produced annually in Lower Manhattan.
Disney parks uses searchlights in their nighttime fireworks displays. they are installed on top of the rooftops of several attractions in Fantasyland.