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This question already has an answer here:

What is the difference between Luminance and Brigthness? If there is any...

marked as duplicate by mattdm, NickM, Itai, Paul Cezanne, AJ Henderson Aug 11 '14 at 14:14

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    Luminance is the scientific measure of how bright something is. Just like asking "what is the difference between fahrenheit and hotness." – Patrick Hughes Aug 9 '14 at 22:37
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    Are you referring to a specific context, like sliders in a piece of software, or just the terms in general? – MikeW Aug 9 '14 at 23:49
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From the comment on the question by Patrick Hughes:

Luminance is the scientific measure of how bright something is. Just like asking "what is the difference between fahrenheit and hotness."

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