Luminous intensity I

Unit of measurement: candela [cd].
A light source generally emits its luminous flux F in different directions. Luminous intensity is the luminous flux emitted through unit solid angle (1 Steradian) in a particular direction.


The spatial distribution of the luminous intensity of a light source produces a three-dimensional luminous intensity distribution graph. A section through this graph produces the luminous intensity distribution curve for the relevant plane. It is usual to use the polar coordinates or the Cartesian coordinates and normalize the values to a luminous flux of 1000 lm for luminaires so the figures can be more easily compared.

Luminous intensity
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