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PandaX

What is the difference between lightness and luminance? I am having trouble understanding it. If illuminance is how bright the light perceived to be. Then if we double luminance, we would get a light that is doubled in brightness perceived, isn't it? Then why do we introduce this new concept lightness?

Nina

@PandaX I found a video that may answer your question, please check it out:

https://www.youtube.com/watch?v=tq2y2BseUaE

In a word: Lightness is a relative term.