Starseeker, thanks a ton. It works !!!
Also, as it didn’t worked at the beginning, I tried a few things. I finally found out what the problem was: I was trying to use multiple “OnActorBeginOverlap” for the same trigger box, and because of that it was firing the first one ( the light ) and ignored the other one ( the box ). Ha ha.
Problem solved with a second trigger box, cloned from the first one, devoted to the light only. Maybe it isn’t elegant, but it works so it’s fine with me.
Thanks again, it’s really appreciated.