Luminous coefficient

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The luminous coefficient is a coefficient that measures the integrated fraction of the radiant power that contributes to its luminous properties as evaluated by means of the standard luminosity function.^[1] The luminosity coefficient is

$\frac{ \int^{\lambda = \infin}_{\lambda = 0} y_\lambda J_\lambda d\lambda } { \int^{\lambda = \infin}_{\lambda = 0} J_\lambda d\lambda },$

where

y_λ is the standard luminosity function,

J_λ is the spectral power distribution of the radiant intensity.

The luminous coefficient is unity for a narrow band of wavelengths at 555 nanometres.

[edit] See also

Luminous efficiency, the more common name for luminous coefficient
Photometry

[edit] References

^ (January 1958) Van Nostrand's Scientific Encyclopedia, 3rd Edition. Princeton, New Jersey, Toronto, London, New York: D. Van Nostrand Company, Inc..