Luminous coefficient
From Free net encyclopedia
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. The luminosity coefficient is:
- <math>\frac{ \int^{\lambda = \infin}_{\lambda = 0} y_\lambda J_\lambda d\lambda } { \int^{\lambda = \infin}_{\lambda = 0} J_\lambda d\lambda }</math>
where
yλ is the standard luminosity function
Jλ is the spectral power distributon of the radiant intensity
The luminous coefficient is unity for a narrow band of wavelengths at 555 nanometres.
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