colour.luminous_flux

colour.luminous_flux(sd: colour.colorimetry.spectrum.SpectralDistribution, lef: colour.colorimetry.spectrum.SpectralDistribution | None = 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 (colour.colorimetry.spectrum.SpectralDistribution | None) – \(V(\lambda)\) 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

float

References

[Wikipedia03b]

Examples

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