1. A luminaire controller for a luminaire comprising:a sensor input configured to receive sensor signals from at least one occupancy sensing device of the luminaire;
a communication interface for communicating with a lighting network;
a mode selector configured to select one of a set of operating modes for the luminaire based on a combination of the sensor signals and incoming occupancy messages received from the lighting network;
a local control component configured to control an illumination source of the luminaire according to the selected operating mode; and
a distributed control component configured to selectively broadcast outgoing occupancy messages via the lighting network when a first of the operating modes is selected by initiating a distributed control procedure when an initiation event occurs, the distributed control procedure, once initiated, being performed as follows:
if a randomized wait interval elapses relative to a timing of the initiation of the distributed control procedure without an incoming occupancy message being received from the lighting network, responding by broadcasting an outgoing occupancy message via the lighting network; and else
if an incoming occupancy notification is received before the randomized wait interval elapses relative to the timing of the initiation, responding by re-initiating the distributed control procedure without broadcasting an outgoing occupancy message and using a new randomized wait interval for each such re-initiation of the distributed control procedure.