A system for controlling a plurality of lighting units that are located in rooms of a building, said system comprising said plurality of lighting units and a user input unit via which a user is able to selectably associate at least one of the plurality of lighting units with a type of room in which it is to be located; wherein said user input unit comprises a wireless communication module configured to wirelessly communicate association data indicative of the association of the at least one of the plurality of lighting units with the type of room in which it is to be located; and wherein each of said plurality of lighting units integrally includes: a wireless communication module configured for wirelessly receiving the association data from the user input unit; an illumination module via which a lighting characteristic is able to be output therefrom; a lighting settings module configured for storing predefined settings of default lighting characteristics that are associated with each type of room, for output by the illumination module; wherein for each type of room the predefined default lighting characteristic is different; a control module whereby, responsive to the association data received via the communication module of the lighting unit, the control module is configured to operate the illumination module of the lighting unit so as to output the default lighting characteristic associated with the type of room with which the lighting unit is associated, by reference to the predefined settings stored in the lighting settings module, the system being characterised in that: the system comprises an online database storing the predefined settings of the default lighting characteristics, wherein the predefined settings of default lighting characteristics are automatically updated periodically, wherein each lighting unit is communicably connected with the online database via an internet connection and configured to automatically download updated settings periodically from the online database into the respective lighting settings module. wherein said user input unit comprises a wireless communication module configured to wirelessly communicate association data indicative of the association of the at least one of the plurality of lighting units with the type of room in which it is to be located; and wherein each of said plurality of lighting units integrally includes: a wireless communication module configured for wirelessly receiving the association data from the user input unit; an illumination module via which a lighting characteristic is able to be output therefrom; a lighting settings module configured for storing predefined settings of default lighting characteristics that are associated with each type of room, for output by the illumination module; wherein for each type of room the predefined default lighting characteristic is different; a control module whereby, responsive to the association data received via the communication module of the lighting unit, the control module is configured to operate the illumination module of the lighting unit so as to output the default lighting characteristic associated with the type of room with which the lighting unit is associated, by reference to the predefined settings stored in the lighting settings module, the system being characterised in that: the system comprises an online database storing the predefined settings of the default lighting characteristics, wherein the predefined settings of default lighting characteristics are automatically updated periodically, wherein each lighting unit is communicably connected with the online database via an internet connection and configured to automatically download updated settings periodically from the online database into the respective lighting settings module. a wireless communication module configured for wirelessly receiving the association data from the user input unit; an illumination module via which a lighting characteristic is able to be output therefrom; a lighting settings module configured for storing predefined settings of default lighting characteristics that are associated with each type of room, for output by the illumination module; wherein for each type of room the predefined default lighting characteristic is different; a control module whereby, responsive to the association data received via the communication module of the lighting unit, the control module is configured to operate the illumination module of the lighting unit so as to output the default lighting characteristic associated with the type of room with which the lighting unit is associated, by reference to the predefined settings stored in the lighting settings module, the system being characterised in that: the system comprises an online database storing the predefined settings of the default lighting characteristics, wherein the predefined settings of default lighting characteristics are automatically updated periodically, wherein each lighting unit is communicably connected with the online database via an internet connection and configured to automatically download updated settings periodically from the online database into the respective lighting settings module. the system comprises an online database storing the predefined settings of the default lighting characteristics, wherein the predefined settings of default lighting characteristics are automatically updated periodically, wherein each lighting unit is communicably connected with the online database via an internet connection and configured to automatically download updated settings periodically from the online database into the respective lighting settings module.