> Quote - Yes, adding a sun with IBL does not make sense with Lux. This is not about Reality. If you have an HDR IBL map you don't need the sun, the illumination will come from the map. > > If you don't have an HDR map then you can use a mesh light mapped small and positioned where it makes sense. > Hope this helps

The problem with pure IBL is that the shadows are awful and unrealistic. Lux does a terrible job of figuring out where the primary light source is even with a really bright sunspot on the HDR. This is because it treats the entire IBL as one huge light from everywhere. By adding a sun you get those shadows back. Here's an example render I did using this technique with Luxus. I'd love to be able to reproduce this with presets in Reality. This same render with pure IBL has no visible shadows at all, despite the glaring sunspot.

Edit: Attachment was too big apparently. (curse that tiny 200k limit)