Lighting cubic patterns problem

Hello!

After many optimization actions to my game for Ipad2, I get this strange lighting patterns at the geometry that I cant figure how to clean. I try to change quality, shaders, lights and camera options but not solution yet. Here are a couple of screens with different setups:

Image 1:

• The plane and walls are just Unity planes and cubes all with Mobile/Diffuse shader.

• 1 Directional light

• Quality settings: simple (default settings)

• Camera: Forward rendering

Image 2:

• The plane and walls are just Unity planes and cubes all with Standard shader.

• 1 Directional light and 1 point light

• Quality settings: Fantastic(default settings)

• Camera: Forward rendering

Any help will be much apprecited!