# 17-22-038

troland

Td

non-SI unit for conventional retinal illuminance and natural pupil luminance

Note 1 to entry: When the eye is viewing a surface of uniform luminance, the numerical value of the conventional retinal illuminance or the natural pupil luminance, expressed in troland, is equal to the product of the area in square millimetres of the limiting pupil, natural or artificial, by the luminance of the surface in candela per square metre.

Note 2 to entry: This entry was numbered 845-02-16 in IEC 60050-845:1987.

Note 3 to entry: This entry was numbered 17-1349 in CIE S 017:2011.

Publication date: 2020-12