Curve of Luminous Intensity Distribution

From International Dictionary of Marine Aids to Navigation
Jump to navigation Jump to search


Curve of Luminous Intensity Distribution (of a light source)

A curve which represents the luminous intensity in a plane passing through the source, as a function of the angle measured from some given direction.

Ch2 Fig6.jpg

Note 1:

  • a. When the curve is polar, the pole is at the point representing the position of the light source.
  • b. When the plane is a meridian plane and the reference direction of angles is vertical, the angles are measured from the downward vertical.

Reference: C.I.E. (modified)

Note 2: The term Candlepower Curve is sometimes used in place of "curve of luminous intensity distribution".

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)


Celsius (previously Centigrade)


charge current




International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM