colour.luminous_efficacy#

colour.luminous_efficacy(sd: SpectralDistribution, lef: Optional[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...