A networked lighting control system having the capability to identify problems within its own wireless network. The system includes a plurality of luminaire nodes. Each luminaire receives, via a wireless mesh network, a series of messages containing an output control indication. The indication represents a “delta” value, which the luminaire uses, for each received message, to generate a control signal to increase the light output of its lamp by a known amount. The luminaire transmits a series of messages containing the output control indication, wherein each transmitted message corresponds to each message that had been received by the luminaire. After a series of such “delta” messages have been originated and broadcast over the mesh network, the luminaires that failed to receive some of the messages will appear dimmer than the luminaires that received all, or more of, the messages, providing a visualization of signal propagation problems.