Burkhard,
The lighting inside a model using physical simulation will be darker indeed, but that is actually more realistic. The other modes use very simplified lighting schemes, and the downside of this is that lighting is more "constant", if that makes sense?
Regarding your conversion of Vue 8 Studio to the Mac platform, that shouldn't be an issue. All our products are cross platform, meaning botht the Mac and Windows versions are included in the product.
Nicholas