You have a point light source behind some walls.
Unity light passing through walls.
You can simulate this in shaders or use raycasts to see if the light is behind a wall.
Although you have enclosed the light indirect light from the light source seems to seep through especially on the ceiling and the floor.
Set the point light s baking property to mixed or baked then bake your lighting data using the lighting tab.
This solution works in other engines like unity and ue4.
Create a unity primitive cube plane etc sized similarly to your wall remove its collider and in the mesh.
By sydon thursday november 2 2017.
Shadows are the obvious answer however i assume you are using lite and that s not an option.
These options have obvious edge cases that can t be easily resolved.
In that case you ll need to be a bit more clever.
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How to fix indirect lights seeping through walls.
It s really just a shadow type setting that needs to be set right.
If either of these don t solve.
This solution works in other engines like unity and ue4.