What is the Melanopic Photopic Ratio (M/P ratio)?

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Our Photopic vision is what we have during the day in a well-lit space. Our Melanopic vision is the biological impact of light. A higher M/P (above 0.8) means the light is more stimulating and better for day time use. A lower M/P (below 0.5) means the light is less stimulating and better for night time use.

 

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