page_title: Light beam
section_title: Visibility from the side as purpose
hierarchical_section_title: Light beam / Visible light beams / Visibility from the side as purpose
caption_attribution_description: English: Lasers Red Laser: 660nm, 635nm Green Laser: 532nm, 520nm Blue Laser 445nm, 405nm
context_page_description: A light beam or beam of light is a directional projection of light energy radiating from a light source. Sunlight forms a light beam when filtered through media such as clouds, foliage, or windows. 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. Light from certain types of laser has the smallest possible beam divergence.
context_section_description: 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.
caption: Laser beams with different wavelengths (405nm - 660nm).
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