# Resolve RDF Terms

quantitykind:SpectralLuminousEfficiency
http://qudt.org/vocab/quantitykind/SpectralLuminousEfficiency

### Recommended prefix

quantitykind:

lang:en
Spectral Luminous Efficiency
lang:""
$$V(\lambda) = \frac{\Phi_\lambda(\lambda_m)}{\Phi_\lambda(\lambda)}$$, where $$\Phi_\lambda(\lambda_m)$$ is the spectral radiant flux at wavelength $$\lambda_m$$ and $$\Phi_\lambda(\lambda)$$ is the spectral radiant flux at wavelength $$\lambda$$, such that both radiations produce equal luminous sensations under specified photometric conditions and $$\lambda_m$$ is chosen so that the maximum value of this ratio is equal to 1.
lang:""
The Spectral Luminous Efficiency is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power. A common choice is to choose units such that the maximum possible efficacy, 683 lm/W, corresponds to an efficiency of 100%.