A system comprising: a controller configured to apply at least one illumination setting to at least one illumination source, thereby causing the illumination source to emit light according to the applied illumination setting; electronic storage accessible to the controller; and a locking device configured to generate a lock command pertaining to the applied illumination setting, wherein the system is configured to mark the illumination setting as locked in the electronic storage in response to the lock command; wherein the controller is configured to receive a control command pertaining to the applied illumination setting, and modify the applied illumination setting according that control command unless the illumination setting is marked as locked when it is received, wherein the illumination setting is not modified in response to that control command in that event.