" lambency "

1: the quality or state of having or giving off light;

  * e.g., " ... the lambency of the sunlit stained-glass window was breathtaking "

•  Synonyms : 

•  brightness,

•  brilliance,

•  brilliancy,

•  candor,

•  dazzle,

•  effulgence,

•  illumination,

•  lightness,

•  luminance,

•  luminosity,

•  luminousness,

•  luster,

•  lustrousness,

•  radiance,

•  refulgence,

•  splendor

•  Antonyms : 

•  blackness,

•  dark,

•  darkness,

•  dullness,

•  duskiness