brightness level
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Noun 1. [画像:brightness level - the quality of being luminous]brightness level - the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"
physical property - any property used to characterize matter and energy and their interactions
illuminance, illumination - the luminous flux incident on a unit area
incandescence - light from heat
glow, luminescence - light from nonthermal sources
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