Method and apparatus for commissioning a lighting system

A lighting system commissioning apparatus, the lighting system including a plurality of light fixtures, and a plurality of light sensors, where a light sensor from the plurality of light sensors is assigned to each light fixture, the apparatus comprising:

• an ambient light module configured to measure ambient light with the light sensor assigned to each light fixture;
• a commissioning module configured to designate each light fixture to a lighting group based on the ambient light measured with the light sensor assigned to each fixture;
• a monitoring module;
• a triggering module;
• and
• a command module;
• wherein:
• prior to measuring ambient light with the light sensor assigned to each light fixture, the monitoring module monitors a clock source signal to identify the presence of a feature in the clock source signal, the triggering module generates a trigger signal in response to identifying the presence of the feature in the clock source signal, and the command module provides the trigger signal to each of a plurality of light fixtures to command each of the plurality of light fixtures to stop outputting light, and
• the clock source signal is a power line communication signal carried by an AC or DC signal used to provide power to the plurality of light fixtures.