colour.luminous_efficacy#
- colour.luminous_efficacy(sd: colour.colorimetry.spectrum.SpectralDistribution, lef: colour.colorimetry.spectrum.SpectralDistribution | None = None) float [source]#
Return the luminous efficacy in \(lm\cdot W^{-1}\) of given spectral distribution using given luminous efficiency function.
- Parameters
sd (colour.colorimetry.spectrum.SpectralDistribution) – test spectral distribution
lef (colour.colorimetry.spectrum.SpectralDistribution | None) – \(V(\lambda)\) luminous efficiency function, default to the CIE 1924 Photopic Standard Observer.
- Returns
Luminous efficacy in \(lm\cdot W^{-1}\).
- Return type
References
Examples
>>> from colour import SDS_LIGHT_SOURCES >>> sd = SDS_LIGHT_SOURCES["Neodimium Incandescent"] >>> luminous_efficacy(sd) 136.2170803...