Light beam
From Wikipedia, the free encyclopedia
A light beam or beam of light is a narrow cone of light energy radiating from a small source. To produce such a 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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[edit] Visible light beams
From the side, a beam of light is only visible if part of the light is scattered by objects: tiny particles, e.g. water droplets (mist, fog, rain), hail, snow, or smoke, or larger objects such as birds. If there are many objects in the light path, then it appears as a continuous beam, but if there are only a few objects, then the light is visible as a few individual bright points.
[edit] Visibility from the side as side-effect
- flashlight - the beam can be directed by hand
- headlight - forward beam; the lamp is mounted in a vehicle, or on the forehead of a person, e.g. built into a helmet
- lighthouse - beam sweeping around horizontally
- searchlight - beam directed at enemy planes
[edit] Visibility from the side as purpose
For the purpose of visibility of light beams from the side, sometimes a haze machine or fog machine is used. The difference between the two is that the fog itself is also a visual effect.
- Laser lighting display- Laser beams are often used for visual effects, often in combination with music.
- 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 premieres; the waving searchlight beams are still to be seen as a design element in the logo of the 20th Century Fox movie studio.
