class AuthController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Registration & Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles the registration of new users, as well as the
    | authentication of existing users. By default, this controller uses
    | a simple trait to add these behaviors. Why don't you explore it?
    |
    */
    use AuthenticatesAndRegistersUsers, ThrottlesLogins;
    /**
     * Where to redirect users after login / registration.
     *
     * @var string
     */
    protected $redirectTo = '/home';
    protected $username = 'username';  // you can put whatever column you want here from your users/auth table

I thought I would share this with others just in case they had the same question.