A presence mimicking system comprises a first lighting system (1A) arranged to illuminate a first environment and a second lighting system (1B) arranged to illuminate a second environment. A computer system configured to receive from the first lighting system an indication of a sequence of illumination settings, at least some of which have been applied to the first lighting system by at least one user when present in a first environment illuminated thereby. The computer system is configured, in response to a mimic instruction, to mimic in the unoccupied second environment the presence of the at least one user of the first environment, by applying a matching sequence of illumination settings to the second lighting system, wherein the computer system is configured to select the first lighting system for use in the presence mimicking from a set of candidate lighting systems, by comparing a profile of the second lighting system with profiles of the candidate lighting systems.