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There are three ways this term can be used: (1) The luminous efficacy of a source of light is the quotient of the total luminous flux emitted divided...
Spectral luminous efficacy (in 'Photometry' article)
The products of Km and the spectral luminous efficiencies are called the spectral luminous efficacies denoted by K(?). The spectral luminous efficacy



= Encyclopedia Article; = Research Update
Spectral photopic and scotopic luminous efficacy curves.
From Encyclopedia article 'Luminous efficacy'