I picked up Reality for Poser yesterday and tried rendering a saved Poser image using Lux. It DOES take much longer, and even when I've got the singular light I have in the scene turned down to something ridiculous like 5% intensity, I'm getting hot spots and the image looks way too bright.

So, it's clear that I have some learning to do insofar as managing light is concerned. I read in the documentation that I can adjust light "on the fly," but I've not noticed how that works yet.  More reading and experimentation is in order.

On the positive side, the Reality plug-in works seamlessly inside Poser, and I really LIKE that I can resume a render in Lux whenever it suits me. I may not use Lux for every render because it takes so long, but in instances where I really need the quality, this might be the way to go.

:)