Abstract: A presence detection system for detecting presence of a living being (2) within an are (4), the system comprising a first light source (6a) providing light of a first spectrum, a first sensing means (8a; 10a) which is arranged to filter the light of the first spectrum. The first sensing means produces a first presence detection signal (12a) based on the light of the first spectrum originated form the first light source and reflected from the living being (2). The presence detection system comprises a processor device (14) for concluding the living being's presence within the area (4) based on the first presence detection signal (12a). The processor device provides a position (22a) of the living being (2) within the area based on the intensity of the first presence detection signal (12a) and based on the known position of the first light source (6a) within the area (4). The invention further relates to a lighting system comprising the above described presence detection system.