Luminous intensity for monochromatic light


Luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. The luminosity function or luminous efficiency function describes the average spectral sensitivity of human visual perception of brightness.

Related formulas


IvLuminous intensity (in candela) (dimensionless)
y_λStandard luminosity function (dimensionless)
IeRadiant intensity (in W/steradian) (dimensionless)