Quote - I think that Lux actually does a really good job at lighting the scene with the IBl map, but it is true the shadows can be too soft. It's very easy to add a mesh light that is small and therefore creates a sharp shadow.

I think this technique is incredibly effective. The IBL gives a very realistic daylight feel overall and the meshlight adds the highlights and shadows in a very controllable way. It's a bit like cinematic lighting in outdoor scenes where powerful artificial lights are used even in full daylight.

The problem I find with Sun (and I think the same is true for the similar Distant and Spotlights, which is why we are discouraged from using them in Lux) is that it can create unnaturally sharp and pointy shadow edges and I've stopped using it for this reason.