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Mesopic vision, sometimes also called twilight vision, is a combination of photopic and scotopic vision under low-light (but not necessarily dark) conditions. Mesopic levels range approximately from 0.01 to 3.0 cd/m2 in luminance. Most nighttime outdoor and street lighting conditions are in the mesopic range.
Measurement, Photometry & Overview
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vision mesopic photopic light scotopic cones rods levels function lighting called conditions nighttime zone photometry two luminance measurement visual wavelength
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