luminousness

n.

1.

the quality of being luminous; emitting or reflecting light.

Noun

1.

luminousness - the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun" Synonyms: brightness level, luminance, luminosity, brightness, light

bright, brightness, brightness level, dull, glow, illuminance, illumination, incandescence, light, luminance, luminescence, luminosity, physical property