contrast rendering factor, <of a lighting system, for a task>
quotient of the contrast of a task under the lighting system considered and the contrast of the same task under reference lighting
Note 1 to entry: The contrast rendering factor has unit one.
Note 2 to entry: This entry was numbered 845-09-62 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-253 in CIE S 017:2011.