# 17-31-098

contrast revealing coefficient, <of a tunnel lighting installation>

qc

quotient of the luminance, Lv, of a road surface and the vertical illuminance, Ev,v, at a specific location in a tunnel

Note 1 to entry: The contrast revealing coefficient is expressed in steradian to the power minus one (sr−1).

Note 2 to entry: This entry was numbered 17-254 in CIE S 017:2011.

Publication date: 2020-12