Light & Engineering Vol. 23, No. 1, pp. 15-24, 2015 Svetotekhnika No. 6, 2014, pp. 32-38 ASSESMENT OF DAYLIGHTING PERFORMANCES OF CLASSROOMS: A CASE STUDY IN KIRKLARELI UNIVERSITY, TURKEY İzzet Yьksek 1, Sertaз Gцrgьlь 2, Sьreyya Kocabey 3, Murat Tuna 4, and Bahtiyar Dursun 3 1 Faculty of Fine Arts, Design and Architecture, Celal Bayar University, Manisa, Turkey 2 Faculty of Engineering and Architecture, Mehmet Akif University, Burdur, Turkey 3 Technology Faculty, Kırklareli University, Kırklareli, Turkey 4 Technical Education Faculty, Kırklareli University, Kırklareli, Turkey E-mail: izzetyuksek@gmail.com ABSTRACT This study was conducted to evaluate the daylighting performances of classrooms. <...> For this study, a classroom in Kayali Campus and two classrooms in Kavakli Campus of Kirklareli University have been selected. <...> In these buildings, the illuminance levels have been measured and standards and design rules have been investigated. <...> Modelling in the Velux Daylight Visualiar simulation program, the classrooms have been evaluated in terms of daylighting parameters. <...> Consequently, window properties that can provide better natural lighting in the classroom have been identified. <...> According to the measurements and the results of the simulation, daylight illuminance levels in these environments has been found to vary by directions. <...> The buildings’ orientation, the window openings on the facade of buildings and the shading elements should be designed at the point of the natural lighting idea by expert designers in the fi eld. <...> Keywords: energy efficiency, daylighting, illuminance, classroom, school lighting, Turkey INTRODUCTION Energy is one of the most important parameters in understanding development and welfare level of countries. <...> The increase in energy consumption affects the balance of supply and demand and countries search for alternative ways to meet energy demands. <...> Countries mostly use conventional energy sources to supply energy demands and this leads to environmental problems. <...> In order to address this problem, renewable and alternative energy sources are sought. <...> The usage of renewable and alternative energy sources prevents environmental pollution and plays an important role in preventing the dependence on other countries for energy resources. <...> The energy consumption of buildings in the use stage differ from the construction <...>