A lighting control system with data logging

A lighting control system comprises a lighting load 3 and a stand-alone sensor unit 1, the sensor unit having a detector element and a control module, the detector element being arranged to generate an output dependent on it detecting the presence/absence of a person, and the control module being arranged to control the lighting load in response to the output of the detector element. The system also comprises a hand-held remote device or commissioning tool 9 comprising a display screen 15 and a communication module 11 configured to enable wireless communication with the sensor unit. The sensor unit further comprises a memory 5 arranged to store data relating to the operation of the lighting load, and a communication module configured to enable wireless communication of the data to the remote device such that at least some of the data may be presented on the display screen of the remote device.