Why would an OBJ model respond weirdly to Light in Unity?

I finally got an OBJ from Daz to Unity with Texture Atlas, it works great now except
the light does the opposite,. When it hits the object, that side of the object is not lit.

When i turn the light to pointaway from the character, that side of the character is lit.

weird! PS, the whole character and clothes and hair is a single OBJ. anywaysWhy could this be happening with the lighting[15142-screen+shot+2013-09-04+at+7.51.24+pm.png|15142]

Sounds like normals are pointing the other way.

If you want to recalculate normals, then you can simply change import setting of normals to Calculate (on ModelImporter settings).