Light & Engineering Vol. 23, No. 3, pp. 24-28, 2015 Svetotekhnika No. 3, 2015, pp. 27-30 LIGHT GUIDE USE AND FACADE LIGHT REFLECTION FOR IMPROVED INSOLATION AND INCREASED DAYLIGHT FACTOR AS PART OF THE RECONSTRUCTION OF CITY HOUSING SYSTEMS Denis G. Gritsienko and Vitaly F. Kasyanov The Moscow State Building University, Moscow E-mail: tez@mgsu.ru ABSTRACT Domestic and foreign technologies are analysed based on their potential to increase insolation and daylight factor when reconstructing city housing systems. <...> Problems are described, the solution of which can improve the ecological situation and levels of comfort for city dwellers when using light guides and refl ection of light using facades. <...> Keywords: town development, city housing system, reconstruction, insolation, daylight factor, light guides 1. <...> INTRODUCTION Town planners face several challenges when reconstructing urban housing system, one of which optimising insolation [1]. <...> Problems are also associated with point building up. <...> Problems also exist with industrial building reconstruction projects, which are inside the housing system. <...> When reconstructing industrial buildings, the building’s functional purpose often changes. <...> When designing and siting administrative and industrial buildings, the question incoming solar energy is considered differently than it is for residential buildings. <...> Therefore, it is imperative to fi nd new effective planning solutions and create new technologies of accounting for conditions of insolation and natural illumination (NI). <...> This should help address existing problems of insolation and NI in a housing system for a more comfortable and economic lifestyle. 2. <...> USE OF FAЗADE LIGHT REFLECTION FOR IMPROVEMENT OF INSOLATION CONDITIONS IN CITY HOUSING SYSTEMS Considering limitations of insolation conditions caused by geometrical features of buildings within an existing housing system, one should pay attention to U-shaped confi guration buildings and to buildings with courtyards. <...> It is known that such buildings are often poorly insolated. <...> In order to improve insolation conditions, hypothetically it is possible to refl ect Light & Engineering Vol. 23, No. 3 Fig. 1. <...> Use of faзade <...>