Abstract
This report addresses the potential for energy savings in lighting in buildings. The main emphasis is on office buildings but most of the solutions are applicable for other commercial buildings as well. Several means directed at reducing the lighting loads are discussed. The most important of these are the use of efficient light production equipment (chapter 4), occupancy scheduling (chapter 5) and daylight harvesting (chapter 6). But also the potential of lesser known energy saving means such as improved lighting maintenance (chapter 7) and the application of a nonuniform electric lighting scheme (chapter 8) are briefly discussed.
A typical non-efficient lighting installation that provides annual energy consumption for lighting of 47 kWh/m2 is described in chapter 11 and used as a base-case for introducing the different energy saving measures. In chapter 12, a step-by-step approach for reducing the energy consumption is outlined and the energy saving potential from each step is roughly estimated.
It is further shown that the results from each of the energy saving measures can be combined in order to achieve substantial energy savings. The combination of more efficient lighting
equipment, occupancy scheduling, daylight harvesting, improved lighting maintenance and the application of a non-uniform electric lighting scheme could provide lighting energy savings of up to 90% compared to the reference situation (47 kWh/m2).
Furthermore, in the near future, solid state lighting (LED and OLED) can be utilized in order to provide even higher energy savings.
A practical example of energy efficient lighting from Miljøbygget in Trondheim is discussed in chapter 13. The main conclusions from the report are summarized in chapter 14.