Lighting is made using Entr0py's Light & Shadow extensions.
I know its been a few months but I cant seem to find this extension you're talking about, where did you get it from?
From here.https://github.com/Entr0py404/GDevelop-3D-Extensions
Actually thank you so much, this single-handedly brought back my inspiration to finish my game 🙏🏽🙏🏽
So glad that I could be of help <3