:The invention provides a control device for controlling an ultraviolet light-based disinfection device arranged at a disinfection location, wherein the control device comprises: a user interface comprising a user interface element, wherein the user interface element is configured to control an operational parameter of the ultraviolet light-based disinfection device by providing a degree of control in controlling said operational parameter; a controller configured to: (i) determine a spatial relation of the control device relative to the ultraviolet light-based disinfection device and/or the disinfection location, and to (ii) change the degree of control of the user interface element in controlling said operational parameter based on said spatial relation.