My space was refitted with all new architectural controls, dimmers, relays, fixtures,
etc... moved to "state of the art..." My Source 4s were replaced/retrofited/augmented with new kit: a lot more Source4WRDs (series 2, white) than I need, plus a gazillion ColorSource Spots (both regular and Deep Blues, some as whole fixtures, some as color engines and barrels, reusing lenses).... I really am happy with everything, but haven't actually done a show with all of it yet.
I would recommend that you use
DMX (RJ45) control on the Source4WRDs... initially they tried just using
line voltage from dimmers, but they cut out/pop on at the low end - that went away when I
DMX'd the fixtures.