colour.luminous_flux

colour.luminous_flux(spd, lef=SpectralPowerDistribution(name='CIE 1924 Photopic Standard Observer', ...), K_m=683.0)

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

Parameters:

• spd (SpectralPowerDistribution) – test spectral power distribution
• lef (SpectralPowerDistribution, 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

• [Wikq]

Examples

>>> from colour import LIGHT_SOURCES_RELATIVE_SPDS
>>> spd = LIGHT_SOURCES_RELATIVE_SPDS['Neodimium Incandescent']
>>> luminous_flux(spd)  
23807.6555273...