Nowadays, interest and opportunities of investigation on daylighting in Architecture are beyond all doubt. This is due to two main reasons, one derived from its energy aspect and the other one because of its capital function in the comprehension of the architectural fact. With regard to the energy issue, we should denote how it has emphasized the importance of controlling the architectural definition of fenestration in order to obtain an adequate use of daylighting. In fact, far-reaching measures, like changes of standard time (daylight saving time) carried out twice a year in many countries, are nothing but the acknowledgement that an adequate use of daylighting means a significant energy saving for those countries. Likewise, the notable effort made during the last decade in daylighting research by the European Union implies another important backing to our initial affirmation. A better knowledge of how daylighting is generated in architectural spaces will lead to an adequate use of available resources while the adequate use of these resources will mean, among other results, an appreciable energy saving.
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