In the SI unit system, luminous intensity is represented as candela (cd). The luminosity function provides a standardized model to determine the sensitivity level of the human eye. Luminous intensity can be used as a factor to determine the quantify the power emitted by any light source in a particular direction for a given unit solid angle.

The quantities employed to express luminous intensity are obvious to most non-scientists.Ī steradian is the standard unit of the solid angle a sphere encloses 4 p, which is approximately equal to 12.57 steradians. Here, A frequency of 540 THz corresponds to a wavelength of about 555 nanometers (nm), which is in the middle of the visible light spectrum and is usually accepted and the human eye is sensitive to this wavelength. Luminous intensity is an expression that describes the amount of light power emitting from a point source within a solid angle of one steradian.įor instance, a frequency of 540 terahertz, i.e., 540 THz or 5.40 x 10 14 Hz is specified. In this article, we will learn about the following topics in detail:

The SI unit of luminous intensity is the candela or cd, it is an SI base unit. It is based on the luminosity function, a standard model of the sensitivity of the human eye. Luminous Intensity is a measure of the wavelength-weighted power radiated by a light source in a particular direction per unit solid angle.

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