The lux (symbol: lx) is the SI derived unit of illuminance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. It is analogous to the radiometric unit watt per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception
Standard Units | |
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Footcandle | {{footcandle}} |
Kilolux | {{kilolux}} |
Lumen/square centimeter | {{lumenpersquarecentimeter}} |
Lumen/square foot | {{lumenpersquarefoot}} |
Lumen/square inch | {{lumenpersquareinch}} |
Lumen/square meter | {{lumenpersquaremeter}} |
Metercandle | {{metercandle}} |
Milliphot | {{milliphot}} |
Nox | {{nox}} |
Phot | {{phot}} |