My model is not reflecting any light / looks dark I was wondering if you could help me out... in the image I have 2 objs, the only difference between the two is that the one on the right is fully unwrapped while the one on the left is the default with no changes safe for the texture to compare the colors... 

Both models have the same texture image and no nodes were modified in the process and yet the one with the unwrapped map looks completely dark as if it is reflecting no light at all. Could you help me understand what happened and if there's a way to fix it?

Thank you for your time!
It's a problem you may find with some imported files, you need to go in the Properties panel > Object Data > Geometry Data, and close Clear Custom Split Normals Data.