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We have measured over a six-month period, from June 1993 to January 1994, the illuminance and luminance in the Ciudad Universitaria of Madrid on clear days. These measurements have allowed us to find the average levels of those magnitudes. We have established simplified models concerning absolute value of global and diffuse horizontal illuminance, and zenithal luminance in clear days. This treatment...
Two elementary empirical models for the dependence of global illuminance on solar elevation for clear skies are provided. The models are developed from hourly data obtained from 1 year data collected at the International Daylight Measurement Programme (IDMP) general class station at the Escuela Tecnica Superior de Arquitectura in Madrid (ETSAM), and are statistically assessed with data obtained during...
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