brightness level vs luminance

brightness level and luminance both are nouns.

Word	Noun	Adjective	Verb	Adverb
brightness level	Yes	No	No	No
luminance	Yes	No	No	No

As nouns, brightness level and luminance are synonyms defined as:

brightness level and luminance: the quality of being luminous; emitting or reflecting light

Other synonyms of brightness level include brightness, light, luminosity, luminousness.

brightness level (noun)	luminance (noun)
the quality of being luminous; emitting or reflecting light	the quality of being luminous; emitting or reflecting light