Hey there @Dahtz! Welcome to the community! Bright white artifacting when lit can come from a number of things, like improper normals, duplicated faces, blown out lights, scaling issues, or other material issues.
Could you check the model for duplicated faces on top of each other?
Could we see the material?
How small does the mesh come in? Here’s a thread where another user found out his meshes were too small during import.