-Coherent light - light waves that vibrate with constant phase relationships. They can be produced by a laser or a combination of two prisms.
-Coincidence rangefinder - see Rangefinder.
light emitting diode (LED)
a semiconductor device that emits incoherent light.
light emitting diode display
type of electronic changeable copy sign that uses hundreds of light emitting diodes in single and tri-color matrixes.
In Photonics, silicon can be used as a continuous wave Raman laser medium to produce coherent light, though it is ineffective as a light source.
 See also: Format, Grade, Film, Group, Series
  
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