radiance

The quality or state of being radiant.

The radiant energy emitted per unit time in a specified direction by a unit area of an emitting surface.

Brightness shooting in rays or beams; hence, in general, brilliant or sparkling luster; vivid brightness.

Radiation.

Synonyms Radiance, Brilliance, Brilliancy, Effulgence, Refulgence, Splendor, Luster. These words agree in representing the shooting out of rays or beams in an Impressive way. Radiance is the most steady; it is generally a light that is agreeable to the eyes: hence the word is often chosen for corresponding figurative expressions.