Blender Import: Lighting problems

I'm new in Unity and i'm trying to do a little map made in blender. So i made the map, made some materials and when i import it to Unity i get some lighting problem. I've found that the problem is generated by the calculating/importing normals.
Here some screens so you can see what really happen:




If i put "None" it go well but there will be no lighint effect


What can i do to fix this? What i'm doing wrong?

 

Try adding more pixel lights in Quality settings, i had a similar problem some time ago and that fixed it
http://docs.unity3d.com/Manual/class-QualitySettings.html

 

The normals of the floor part that is close to the camera seem to be wrong. How does it look if you import the normals?

 

I found the error!
There was some doubles in my model so i selected all the mesh and used "Remove Doubles" and it fixes the problem

 

Interesting insight! I didn't consider that case when I saw the picture.