brightness
bright-ness
noun
The quality of being intelligent, clever, or full of cheer.
"Her intellectual brightness was evident in her work."
noun
The quality or state of emitting or reflecting much light.
"Adjust the screen brightness to save your eyes."
Thesaurus
Synonyms: luminance, luminousness, luminosity, light, brightness level, cleverness, smartness
Antonyms: dullness