How do i make lighting not go through floors on compatibility mode

im using surface lights and have shadows enabled on. ive tried to stop it from going through the ground but i have no idea how to fix this. what way is there for me to have the lighting not go through floors on compatibility mode?

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Iā€™m pretty sure its just the way the lighting works.

I dont think there is any solution to this. I may be wrong but I am almost certain there is no solution unless you change the Technology.

Ive checked it out for you right now using 2 rooms with one room equiped with a SurfaceLight to see if theres any solution using Compatibility Technology.

Here is when the surface light with a range of 15.287 which hits the wall perfectly with Shadows enabled but light enters into the other room:


Here is when I decreased the light range to 7.654 which does not hit the surface of the wall and the light shining against the wall is quite faint. However the light does not go into the other room: