Going off by your suggestion, I’m guessing the resulting scripting is supposed to look like this?
I followed your advice to simply create the dynamic material instance once on Event BeginPlay, and returned it into Headlights_Mat, and this is the result.
It works just like it’s supposed to, but now it’s way simpler to use. Is there no chance that I can simplify it even further? It’ll likely still be quite long when I have to involve the other lights, such as the turn signals and rear lights.