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The Sun has an intrinsic luminosity of 3.83 × 10 26 watts.In astronomy, this amount is equal to one solar luminosity, represented by the symbol L ⊙.A star with four times the radiative power of the Sun has a luminosity of 4 L ⊙.
One may distinguish between the cases of small and large stellar masses by deriving the above results using radiation pressure. In this case, it is easier to use the optical opacity and to consider the internal temperature T I directly; more precisely, one can consider the average temperature in the radiation zone.
The luminous flux accounts for the sensitivity of the eye by weighting the power at each wavelength with the luminosity function, which represents the eye's response to different wavelengths. The luminous flux is a weighted sum of the power at all wavelengths in the visible band. Light outside the visible band does not contribute.
In astronomy, absolute magnitude (M) is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale; the more luminous (intrinsically bright) an object, the lower its magnitude number.
The Schechter luminosity function [5] provides an approximation of the abundance of galaxies in a luminosity interval [+]. The luminosity function has units of a number density n {\displaystyle n} per unit luminosity and is given by a power law with an exponential cut-off at high luminosity
A luminous efficiency function or luminosity function represents the average spectral sensitivity of human visual perception of light. It is based on subjective judgements of which of a pair of different-colored lights is brighter, to describe relative sensitivity to light of different wavelengths .
Luminance a measure of light, spectrally weighted per the Luminous efficiency function. Luminous efficiency function, in colorimetry, the curve which defines the visual sensitivity of the human eye to light of different wavelengths. In the early 20th century this was briefly referred to as the luminosity function but that use was depreciated to ...
The lux (symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI). [1] [2] It is equal to one lumen per square metre.In photometry, this is used as a measure of the irradiance, as perceived by the spectrally unequally responding human eye, of light that hits or passes through a surface.