colour.luminous_efficacy

colour.luminous_efficacy(spd, lef=SpectralPowerDistribution(name='CIE 1924 Photopic Standard Observer', ...))[source]

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

Parameters:
Returns:

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

Return type:

numeric

References

Examples

>>> from colour import LIGHT_SOURCES_RELATIVE_SPDS
>>> spd = LIGHT_SOURCES_RELATIVE_SPDS['Neodimium Incandescent']
>>> luminous_efficacy(spd)  
136.2170803...