luminance

名词 luminance:

1. the quality of being luminous; emitting or reflecting light
   同义词：luminosity, brightness, brightness level, luminousness, light

lu.mi.nance

n.（名词）
The condition or quality of being luminous.
发光：能发光的状态或特征
Physics The intensity of light per unit area of its source.
【物理学】 亮度：每单位发光区的光的强度