[10.5.5.2.2]
NOTE: This term was added in RP-16-17 Addendum 2.
Sky luminance distribution models based on the work of Richard Perez derived from measured irradiance data for the direct solar and sky components.
Ref.: Perez R, Seals R, Michalsky J. All-weather model for sky luminance distribution – Preliminary configuration and validation. Solar Energy. 1993;50(3).
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