[Lighting] Different lighting on connected objects

Hi guys,

This is my first post here so if I got the place wrong, please bear with me.

I'm working on my first Unity project and here's the issue I have :

I have two sections of a hallway snapped to each other, and several point lights lighting every thing. The thing is, both objects are lighten differently which makes the connection between them awful:



Reading other threads, I'd figure that this is a problem with my normals, but how do I fix it?

Both parts of the corridor are made under Blender.

Thanks for help!