In that case you ll need to be a bit more clever.
Unity light going through walls.
Shadows are the obvious answer however i assume you are using lite and that s not an option.
It s really just a shadow type setting that needs to be set right.
If either of these don t solve.
Set the point light s baking property to mixed or baked then bake your lighting data using the lighting tab.
Since you re using unity free put the plane on a specific layer.
That s why shadows exist.
These options have obvious edge cases that can t be easily resolved.
Here is how to fix it.
I am using gaia for the terrain and have the lighting set to afternoon light for those familiar with the program.
Although you have enclosed the light indirect light from the light source seems to seep through especially on the ceiling and the floor.
Then click on your light click on the culling mask dropdown then uncheck the layer the object is on.
Although you have enclosed the light indirect light from the light source seems to seep through especially on the ceiling and the floor.
The layers are the dropdown box in the upper right of the inspector.
You have a point light source behind some walls.
Light passing through walls 1.
Now the light will not affect the object.
You can simulate this in shaders or use raycasts to see if the light is behind a wall.