Light & Engineering Vol. 24, No. 1, pp. 73-81, 2016 Svetotekhnika No. 1, 2016, pp. 8-14 AN EXPERIMENTAL INVESTIGATION OF MIRROR LIGHTING Filiz Aзari Erbil and Leyla Dokuzer Цztьrk Department of Architecture, Faculty of Architecture, Yıldız Technical University Beşiktaş, Istanbul, Turkey E-mail: acarifiliz@hotmail.com; dokuzer@yildiz.edu.tr ABSTRACT The aim of this study is to investigate the preferred vertical illuminance and luminaire placements for mirror lighting experimentally. <...> For this purpose, a mirror is fixed on a wall of the mock-up room and three linear luminaires are placed around the mirror; one on each side and one above the mirror. <...> Twenty-seven lighting scenarios have been designed by using three luminaires around the mirror for local lighting and four indirect suspended luminaires providing general lighting in the room. <...> Lighting scenarios were based on different lighting arrangements and six vertical illuminance steps between 300 lx and 2000 lx. <...> Surveys have been performed to determine the impressions and judgements of the participants in terms of illuminance provided, shadows produced and glare caused in each scenario. <...> Due to their functional properties, mirrors are used extensively in bathrooms, bedrooms, entrance halls of residential buildings; 73 in restrooms of all buildings; in dressing rooms, back stage, beauty salons, etc. <...> To get truthful images, the type, number and place of the luminaires around the mirror and the vertical illuminance provided are crucial. <...> Luminaires can cause direct glare depending on their position in the field of observer’s view and direct light from the luminaires can create shadows on the face. <...> The recommended angle between the line of view and the reflected image of the luminaire in the mirror lies between 300 and 600 to avoid direct glare [1–2, 4]. <...> The mentioned standard recommends 200 lx on the horizontal utilised plane in these types of spaces, but does not include any suggestions concerning the vertical illuminance on the facial plane. <...> Цztьrk and Sirel propose 500 lx on the vertical facial plane [1–2]. <...> Numerous inappropriate lighting applications can be seen in practice, popular literature, and product catalogues of luminaire and furniture com Light & Engineering Vol. 24, No. 1 Fig. 1. <...> The objective of this work is to investigate experimentally the most preferred luminaire <...>