How to make hidden light with Lumen? (5.0-ea2)

Hi is there a way to have hidden lights with lumen? What I mean could be seen in the picture - where the wall is bending the light disappear.

I’ve tried to remove the ceiling above the false visible one, the environmental light could penetrate that gap, point light also does, but the light from emissive material or a rectangular light doesn’t

So is there a workaround for a curved wall like this?