= Luminous efficacy
{title2=$K=\Phi_v/\Phi_e$}
{wiki}
The <luminous efficacy> of radiation is <luminous flux> divided by total <radiant flux>, in $\mathrm{lm\,W^{-1}}$, for the specified visual conditions. For nonzero <radiant flux>, it is a spectral <weighted mean> of <spectral luminous efficacy>. Specify the denominator: a lamp's <luminous efficacy> relative to electrical input <power> also includes conversion losses and is a different ratio. <luminous efficacy of radiation, for a specified photometric condition>{ref}
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