Two visible light beams projected by 88 searchlights were used to symbolize the missing towers of the World Trade Center as part of the Tribute in Light in remembrance of the September 11, 2001 attacks.
A light beam or beam of light is a narrow projection of light energy radiating from a source into a beam. Sunlight is a natural example of a light beam when filtered through various mediums (clouds, foliage, windows, etc). To artificially produce a light beam, a lamp and a parabolic reflector is used in many lighting devices such as spotlights, car headlights, PAR Cans and LED housings
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