a state or quality of radiating or reflecting light
2.
a measure (in candelas per square metre) of the brightness of a point on a surface that is radiating or reflecting light. It is the luminous intensity in a given direction of a small element of surface area divided by the orthogonal projection of this area onto a plane at right angles to the direction
Symbol: L
Word origin
C19: from Latin lūmen light
luminance in American English
(ˈlumənəns)
noun
1.
the quality or state of being luminous
2.
a measure of the brightness of a luminous surface, measured in candelas per unitarea
Word origin
< L lumen (gen. luminis), light1 + -ance
Examples of 'luminance' in a sentence
luminance
A flame, like a candle flame but burning with a clear magnesium-white luminance, was flickering on the tip of her forefinger.