Energy-Efficient Lighting in Commercial Buildings
A Comparison of 9 Buildings in 5 Countries
Per-Erik Nilsson
CASU (CADDET Analysis Support Unit), Sweden
Stefan Aronsson
CASU, Sweden
Abstract
Sixteen retrofit projects have been demonstrated on 9 sites in a number of CADDET (Centre for the Analysis and Dissemination of Demonstrated Energy Technologies) member countries. Each demonstration has involved the installation of measures designed to improve lighting efficiency in existing buildings. In some cases this has been by control only; in other cases improvements have been made to the luminaires themselves which have resulted not only in a reduced electricity consumption but also in better lighting quality. Although installations vary considerably in complexity and economic effectiveness, a number of conclusions can be drawn.
Most projects resulted in considerable savings in the electricity used for lighting purposes. These savings range from just over 20% to well over 80%, depending on the measure(s) installed. It is shown, furthermore, that substantial savings can still be achieved, even in buildings with a comparatively low initial use of electrical energy for lighting. Simple paybacks vary from one to eight and a half years.
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