colour.luminous_efficacy¶

colour.luminous_efficacy(sd, lef=SpectralDistribution(name='CIE 1924 Photopic Standard Observer', ...))[source]¶

Returns the luminous efficacy in \(lm\cdot W^{-1}\) of given spectral distribution using given luminous efficiency function.

Parameters

sd (SpectralDistribution) – test spectral distribution
lef (SpectralDistribution, optional) – \(V(\lambda)\) luminous efficiency function.

Returns

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

Return type

numeric

References

[]

Examples

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