Indoor Daylight Spectral Characteristics and Illuminance Levels Measurements in Deep Space Rooms and its Evaluation for Human Visual and Biological Response

Slovak standards and regulations for design and evaluation of indoor daylight in residential buildings require average values of the Daylight Factor (D) in two check points as basic criterion. In offices, the daylighting is evaluated in workplaces which can be often situated far from window. In this paper are presented results of daylighting measurements in deeper positions in three model rooms with different internal coloured surfaces which are exposed only to natural daylight during cloudy days. Positions are investigated from point of view of visual and biological response performance, represented by circadian efficiency, which may be significantly influenced by indoor surface’s colour selection.