Evaluation of the electricity savings resulting from a control system for artificial lights based on the available daylight

Natural lighting in building environments is an important aspect for the occupants' mental and physical health. Furthermore, proper exploitation of this resource can bring energy benefits related to reduced use artificial lighting. This work provides some estimates that be saved by using a system recognises indoor illuminance. In particular, it able manage switching on lights according daylight detected room. The savings from solution depend size orientation window. analysis conducted office means simulations INLUX-DBR code. locations have influence luminance characteristics sky. with reference one city south north Italy (Cosenza Milan). saving almost independent latitude therefore representative Italian territory. highly variable exposure, being highest southern exposure (97% window equal 36% floor area) between 26% 48% (as function size) northern exposure.