LED fixtures can interfere with the TMCC or DCS signal, I have experienced it personally! It's actually probably the switching power supply in the fixture, at least it was in my case.
I have LED lighting on my workbench, and it was driven by a small switching power module. Obviously, it was a "dirty" module emitting EMI. With the bench lights on, I couldn't work on command equipment on the bench. When I finally figured it out, I replaced the switching power supply with a transformer based linear supply, problem solved.