I have the new one from DAZ, Luxus

There is a very active thread in the DAZ forums that the developer is taking part in.

I believe you have to have at least DS 4.5.1.56 for it to work

Works fine with Luxrender 1.2.  Haven't tried it in the 1.3 dev builds because only using SLG in that one anyway

The materials and lights are saved in the DS scene, so you have a better idea of what the Lux materials are doing rather than the black box approach that Reality uses.

I also have Reality 2.5 which has been extensively discussed in other threads