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John Page Availability of Daylight in Europe and Design of A European Daylight Atlas Expert to the Commission of the European Communities on CEC Daylighting Programmes Joule 1 & Joule 2 Sheffield University, United Kingdom Abstract This paper firstly reports action on the Joule 1 daylighting measurement programme, which has been initiated and partly funded by DGXII of the CEC under their Joule 1 programme. The programme of observations is complete and a full report is now being prepared on the whole project. Measurements of considerable complexity have been completed in five very different climates, Nantes and Lisbon on or near to the Atlantic coast, BRE Garston north of London, and Vaulx-en-Velin close to Lyon. Data for one Mediterranean site has been obtained from Athens, which has a fairly polluted daylight climate. A systematic set of luminance data has been archived for the BRE site. These data have been used to evaluate the accuracy of different daylighting luminance models under different amounts of cloudiness. An important aim of the programme has been to try to understand the climatic factors which influence daylighting climate rather than simply to assemble measurement data. Considerable attention has been given to testing daylight prediction algorithms, which use the luminous efficacies of sunlight and skylight to derive daylight data from observed solar radiation data. Such validated models will be used in the further development of the CEC work on daylighting climatology, using the widely available standard observations of irradiation. The paper secondly reviews the aims and objectives of the recently started CEC DGXII Joule 2 daylighting programme. This again has been initiated and partly funded by the CEC DGXII. The main goal of this second project is to publish a daylighting design atlas covering the present European community countries, but measurements are also ongoing at 4 of the 5 sites used in Joule 1 to extend the existing daylighting data series in time.
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