colour.luminous_flux

colour.luminous_flux(sd: colour.colorimetry.spectrum.SpectralDistribution, lef: Optional[colour.colorimetry.spectrum.SpectralDistribution] = None, K_m: float = CONSTANT_K_M) → float

Return the luminous flux for given spectral distribution using given luminous efficiency function.

Parameters

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

• lef (Optional[colour.colorimetry.spectrum.SpectralDistribution]) – \(V(\lambda)\) luminous efficiency function, default to the CIE 1924 Photopic Standard Observer.

• K_m (float) – \(lm\cdot W^{-1}\) maximum photopic luminous efficiency.

Returns

Luminous flux.

Return type

numpy.floating

References

[Wikipedia03c]

Examples

>>> from colour import SDS_LIGHT_SOURCES
>>> sd = SDS_LIGHT_SOURCES['Neodimium Incandescent']
>>> luminous_flux(sd)  
23807.6555273...

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