Luminous intensity, in photometry, 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. Luminous intensity is the perceived power per unit solid angle.
The SI unit of luminous intensity is the candela (cd), an SI base unit.
vCalc's Luminous Intensity folder contains the conversions based on the candela.