# 17-25-105

photometric inverse square law

special case of the photometric distance law where the surface is perpendicular to the direction of illumination and the relationship becomes

Note 1 to entry: For radiometric sources the equivalent term is "radiometric inverse square law".

Note 2 to entry: This entry was numbered 17-913 in CIE S 017:2011.

Publication date: 2020-12