Controller for controlling a plurality of lighting units in a space and a method thereof

A method (400) of controlling a plurality of lighting units (112, 114) in a space is disclosed. The method (400) comprises: receiving (402) an input indicative of an activation of a plurality of light settings for the plurality of lighting units (112, 114), obtaining (404) location information indicative of locations of the plurality of lighting units (112, 114) relative to a location and/or an orientation of a user in the space (130), obtaining (406) a circadian rhythm value for each light setting, wherein the circadian rhythm value is indicative of an impact of a respective light spectrum of a respective light setting on the circadian rhythm of a person, mapping (408) the plurality of light settings onto the plurality of lighting units (112, 114), wherein each light setting is mapped onto a lighting unit based on the light setting's respective circadian rhythm value and based on the lighting unit's respective location relative to the location and/or orientation of the user, and controlling (410) the plurality of lighting units (112, 114) according to the mapped light settings.