luminance
noun/ˈluːmɪnəns/
/ˈluːmɪnəns/
[uncountable] (physics)- the amount of light given out in a particular direction from a particular areaWord Originlate 19th cent. (as a general term meaning ‘light, brightness’): from Latin luminant- ‘illuminating’ (from the verb luminare) + -ance.
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luminance