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Illuminance Converter
The amount of light shining on a specific region of an object's surface is expressed as illumination. This value depends on the human perception of the brightness of the light of different wavelengths, corresponding to distinct colors. Because humans perceive light with a wavelength of around 550 nanometers and close by (green) as brighter than light with longer or shorter wavelengths (purple, blue, red), illumination calculations are adjusted for each wavelength. It's common to compare illumination to how bright something seems to the human eye.
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