colour.luminous_efficacy¶
- colour.luminous_efficacy(sd: colour.colorimetry.spectrum.SpectralDistribution, lef: Optional[colour.colorimetry.spectrum.SpectralDistribution] = 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 (Optional[colour.colorimetry.spectrum.SpectralDistribution]) – \(V(\lambda)\) 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...