master lighthouse

[1cesc1]

As I've read online (and empirically confirmed myself) if I run SteamVR without an hmd, even if I use a two 2.0 lighthouse configuration, the reference frame according to which the tracker's position is taken is integral with one lighthouse (apparently the first that is detected, even though I have no criteria to verify it).

This means that if the 'master lighthouse' is covered while running tracker_test.py, the program will stop, meanwhile covering only the other doesn't seem to affect the execution.
Despite both lighthouses are detected while running tracker_test.py (as confirmed both by the SteamVR window highlighting their icon and tracker_test.py printing their serial ecc.), I was wondering if the second lighthouse actually contributes to the tracking.