Daylight in interiors can be considered under various aspects: - The psychological effect, which includes the subjective impression of lightness and the visual contact to the outside. - The visual conditions, which concern, for example, adequate illuminance for fulfilling the visual task performance, and glare limitation. - The biological effect, which concerns health, well-being and performance. - Thermal comfort, which concerns the limitation of detrimental radiation exposure and heat input. - Energy efficiency, which concerns the reduction of energy use in buildings by the use of daylight. The standard specifies minimum requirements to achieve a sufficient subjective impression of lightness with daylight in interiors and to establish sufficient visual contact to the outside. Furthermore, requirements for sun exposure of living and recreational areas are given. Currently, not enough knowledge exists for the biological effect of daylight to deal with it normatively. The standard provides information on adequate lighting conditions in interiors due to daylight and on glare limitation and heat input. Partial ratings on energy efficiency of daylight lighting can be calculated using this standard. The standard applies for all common rooms including working areas within the context of the Bauordnungen der Länder (state building regulations) or the Arbeitsstättenverordnung (workplace ordinance). The standard also applies for any working area other than in common rooms (for example, working areas in warehouses) as long as the daylight is not in conflict with the type and task of work. This document has been prepared by Working Committee NA 058-00-06 AA "Innenraumbeleuchtung mit Tageslicht" ("Daylight interior lighting") of the Lighting Technology Standards Committee (FNL).