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Dieser Beitrag befasst sich mit der Beleuchtung von Arbeitsstätten und hier insbesondere mit natürlichem Tageslicht durch Dachoberlichter. Es werden sowohl die beleuchtungstechnischen Anforderungen durch den Gesetzgeber und andere Rechtsnormensetzer geschildert, als auch die normative Seite angesprochen. Neben den besonderen Vorteilen des Tageslichtes zu Beleuchtungszwecken wird die Planung der Beleuchtung mit Dachoberlichtern auch unter Zuhilfenahme von Faustformeln erläutert. Abschließend werden neue EDV‐technische Planungstools vorgestellt.Lighting of work places by rooflights.This contribution deals with the lighting of work places and especially with daylight by rooflights. The lighting engineering requirements by legislation and other legal norm setter as well as the standardization point of view were described. Besides the particular advantages of daylight for lighting purposes this contribution gives instructions for the planning of lighting by rooflights also by using rules of thumb. Finally new software design tools were presented.

Over the last years – on national as well as on international level – integrated rating methods (daylighting as well as artificial lighting) have been developed and transferred into practice, the later was fostered by integration into the corresponding standards (DIN V 18599-4, EN 15193-1) and the methods being referenced by national regulations like the German Building Energy Conservation Ordinance (EnEV). Emerging new lighting technologies und requirements to further improve the rating procedure pushed the development of additional new efficiency figures. The concept of expense factors has long been available and applied e.g. in the domain of heating systems. Now, as derived in this publication, it is as well assigned to indoor lighting systems. Therefore, from now on, it will be possible to differentiate lighting installations by their net energy and by their final energy demand. The efficiency of the lighting system itself can be described as function of the expense factor. Currently several new LED-products (lamps and luminaires) are introduced to the market of general lighting. In order to enable practitioners to energetically rate these products, the diversity of products has been structured into classes with assigned efficiency figures. Lighting appliances strongly depend on how the considered zone is used. To provide practioners with exemplary solutions (type of lighting system, façade composition, lighting control) a collection of typical appliances as function of zone usage has been established. This collection has been matched to the structure of the German DIN V 18599 standards

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