Maintaining a lighting system

A computer system for maintaining a lighting system comprising multiple luminaries installed at known locations in an environment, wherein each is configured to emit a unique luminaire identifier into the environment, the computer system comprising:

• a computer interface configured to connect to a database, wherein the database holds multiple location identifiers, each of which identifies one of the known locations;
• computer storage holding executable management code;
• a processor connected to a memory, wherein the management code is configured when executed on the processor to implement the following steps:
• identifying a route through the environment based on the location identifiers, the route traversing a plurality of the known locations;
• receiving data generated by moving a photodetector along the route through the environment, wherein the data conveys a sequence of the luminaire identifiers detected by the photodetector from luminaries encountered in moving along the route, the sequence being in order of detection;
• and
• performing a database update by, for at least one luminaire identifier in the sequence:
• identifying its position in the sequence, and updating the database based on the at least one luminaire identifier and its identified position in the sequence.