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
Returns

Luminous efficacy in \(lm\cdot W^{-1}\).

Return type

numpy.floating

References

[Wikipedia05b]

Examples

>>> from colour import SDS_LIGHT_SOURCES
>>> sd = SDS_LIGHT_SOURCES['Neodimium Incandescent']
>>> luminous_efficacy(sd)  
136.2170803...