colour.luminous_flux

colour.luminous_flux(sd, lef=SpectralDistribution(name='CIE 1924 Photopic Standard Observer', ...), K_m=683.0)[source]

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

Parameters:
  • sd (SpectralDistribution) – test spectral distribution
  • lef (SpectralDistribution, optional) – \(V(\lambda)\) luminous efficiency function.
  • K_m (numeric, optional) – \(lm\cdot W^{-1}\) maximum photopic luminous efficiency
Returns:

Luminous flux.

Return type:

numeric

References

[Wikipedia2003b]

Examples

>>> from colour import LIGHT_SOURCES_SDS
>>> sd = LIGHT_SOURCES_SDS['Neodimium Incandescent']
>>> luminous_flux(sd)  # doctest: +ELLIPSIS
23807.6555273...