A lighting control system for a lighting system comprising: - an input for receiving lighting control inputs from a user; - a communication interface for communicating with the lighting system; - a manual control module configured to control light emitted by illumination sources of the lighting system according to the lighting control inputs from the user; characterised in that the lighting control system further comprises: - an engagement module configured to determine from the lighting control inputs a user engagement level for at least one of the illumination sources, wherein the user engagement level for the at least one of the illumination sources is a measure, generated by the lighting control system, of an extent to which the user has chosen to exert direct, manual control over the at least one of the illumination sources; - a trigger engine configured to randomly generate control triggers for the at least one illumination source based on the user engagement level, wherein the probability of a control trigger being generated within a time interval increases as the user engagement level decreases; and - an autonomous control module configured to respond to the randomly generated control triggers for the at least one illumination source, when generated, by autonomously controlling the at least one illumination source to render a lighting effect or autonomously suppressing a lighting effect for the at least one illumination source. - an input for receiving lighting control inputs from a user; - a communication interface for communicating with the lighting system; - a manual control module configured to control light emitted by illumination sources of the lighting system according to the lighting control inputs from the user; characterised in that the lighting control system further comprises: - an engagement module configured to determine from the lighting control inputs a user engagement level for at least one of the illumination sources, wherein the user engagement level for the at least one of the illumination sources is a measure, generated by the lighting control system, of an extent to which the user has chosen to exert direct, manual control over the at least one of the illumination sources; - a trigger engine configured to randomly generate control triggers for the at least one illumination source based on the user engagement level, wherein the probability of a control trigger being generated within a time interval increases as the user engagement level decreases; and - an autonomous control module configured to respond to the randomly generated control triggers for the at least one illumination source, when generated, by autonomously controlling the at least one illumination source to render a lighting effect or autonomously suppressing a lighting effect for the at least one illumination source. - an engagement module configured to determine from the lighting control inputs a user engagement level for at least one of the illumination sources, wherein the user engagement level for the at least one of the illumination sources is a measure, generated by the lighting control system, of an extent to which the user has chosen to exert direct, manual control over the at least one of the illumination sources; - a trigger engine configured to randomly generate control triggers for the at least one illumination source based on the user engagement level, wherein the probability of a control trigger being generated within a time interval increases as the user engagement level decreases; and - an autonomous control module configured to respond to the randomly generated control triggers for the at least one illumination source, when generated, by autonomously controlling the at least one illumination source to render a lighting effect or autonomously suppressing a lighting effect for the at least one illumination source.