Most emergency lighting manufacturers offer switch and monitoring modules for connecting third-party luminaires to central power systems. During a mains failure or function testing, these modules switch the luminaires on and monitor the connected load. If a lamp is defective, the monitoring module reports a luminaire fault to the central power system.
At least in theory. In practice, however, the luminaires or inbuilt drivers need to satisfy certain criteria if fault detection is to be reliable.
Which problems occur and which criteria need to be fulfilled.