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

[Wik05d]

Examples

>>> from colour import LIGHT_SOURCES_SDS
>>> sd = LIGHT_SOURCES_SDS['Neodimium Incandescent']
>>> luminous_efficacy(sd)  # doctest: +ELLIPSIS
136.2170803...