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:
Returns:

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

Return type:

numeric

References

[Wikipedia2005c]

Examples

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