Commissioning Lighting Systems

A lighting system includes luminaires (L,1, L,2) disposed in a space to be illuminated, a sensor system (S1, S2) to detect user presence within the space, and a controller (2) configured in a commissioning mode to receive data corresponding to the addresses of luminaires which are to be defined as a group, and positional data from the sensor system in response to commissioning actuator e.g. a person moving along a path associated with a region of the space associated with the group, and in an operational mode to illuminate the luminaires of the group in response to the sensor system detecting occupancy in the region associated with the group.