law relating the illuminance,
Note 1 to entry: to entry: The formula in the definition is sometimes written:
where the exponent,
Note 2 to entry: Taking into account the relationship between atmospheric transmissivity,
Note 3 to entry: This entry was numbered 845-11-27 in IEC 60050-845:1987.
Note 4 to entry: This entry was numbered 17-34 in CIE S 017:2011.