Article
Article
Luminous efficacy
Article By:
Koshel, R. John Photon Engineering, LLC, Tucson, Arizona.
Last reviewed:January 2020
DOI:https://doi.org/10.1036/1097-8542.391400
The response in lumens per watt of the human visual system to radiant flux. The luminous efficacy is dependent on wavelength and the illumination conditions, including photopic (light-adapted, with luminance ≥3 cd/m2), scotopic (dark-adapted, with luminance ≤0.001 cd/m2), and mesopic (combinations of photopic and scotopic illumination in the range between these two levels).
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