colour.luminous_efficiency

colour.luminous_efficiency(sd: colour.colorimetry.spectrum.SpectralDistribution, lef: colour.colorimetry.spectrum.SpectralDistribution | None = None) → float

Return the luminous efficiency of given spectral distribution using given luminous efficiency function.

Parameters

• sd (colour.colorimetry.spectrum.SpectralDistribution) – test spectral distribution

• lef (colour.colorimetry.spectrum.SpectralDistribution | None) – \(V(\lambda)\) luminous efficiency function, default to the CIE 1924 Photopic Standard Observer.

Returns

Luminous efficiency.

Return type

float

References

[Wikipedia03b]

Examples

>>> from colour import SDS_LIGHT_SOURCES
>>> sd = SDS_LIGHT_SOURCES["Neodimium Incandescent"]
>>> luminous_efficiency(sd)  
0.1994393...