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When measured daylighting data are not available, but solar radiation is recorded, if values of the luminous efficacy are known, daylighting data can be estimated. In this paper we give the results of measurements of the luminous efficacy of global solar radiation, obtained in Madrid, in April, May and June, 1989, which are the first published for a Spanish location. We study the dependence of the luminous efficacy on cloudiness. Measurements are compared with those undertaken in other location where continuous measurements are available. We study the dependence of luminous efficacy on solar elevation for different degrees of cloudiness.

Eficacia luminosa de la radiación solar global para superficie horizontal en Madrid. España