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

[Wikipedia05d]

Examples

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