luminance

Noun
  1. The quality of being luminous;
    Emitting or reflecting light (synset 105025269)
    "its luminosity is measured relative to that of our sun"
    tells us about:
    • bright - emitting or reflecting light readily or in large amounts
    • dull - emitting or reflecting very little light
    is a type of: physical property - any property used to characterize matter and energy and their interactions
    subtypes:
    same as: brightness, brightness level, light, luminosity, luminousness

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