That s why shadows exist.
Unity directional light bleeding trhough wall.
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As an off the wall guess though it looks like your trying to force beta your lighting values far beyond their limitations that is causing the lighting solution to bleed.
If a light is next to a wall on one side you can see it on the floor on the other side.
This is caused because the use inverse squared falloff is set to on by default forcing you to have to use way more lights than whats needed or to set it s value far outs side acceptable values.
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You can simulate this in shaders or use raycasts to see if the light is behind a wall.
These options have obvious edge cases that can t be easily resolved.
Place it just behind your wall so that it blocks the light from leaking out.
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Create a unity primitive cube plane etc sized similarly to your wall remove its collider and in the mesh renderer properties set it to shadows only.
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A potential solution is to open the gameobject s mesh renderer a mesh component that takes the geometry from the mesh filter and renders it at the position defined by the object s transform component.
In that case you ll need to be a bit more clever.
Shadows are the obvious answer however i assume you are using lite and that s not an option.
Any help is greatly appreciated.
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I was wondering how i could go about culling the lights so they no longer shine through walls.