The present invention relates to a disinfecting lighting device (1) comprising at least one disinfecting light source (2) providing disinfecting light and at least one beam angle adjustor (3) comprising at least one first optical element (4), wherein the at least one first optical element (4) is arranged to direct a beam (5) of the disinfecting light in a first emission direction (A), wherein the beam (5) of the disinfecting light has a first volume in space. The disinfecting lighting devices further comprises at least one first sensor (6) comprising a first viewing direction (B) and a first field of view (7), the first viewing direction (B) being substantially the same as the first emission direction (A), the first field of view (7) having a second volume in space arranged adjacent to the first volume in space. The at least one first sensor (6) is mechanically coupled to the first optical element (4). The disinfecting lighting device further comprises a processor being arranged to receive a first signal from the at least one first sensor (6). The processor is arranged to perform a first action if the first signal is below a first threshold, and a second action if the first signal is above the first threshold.