I'm a beginner with 3D compositions (I discovered DAZ last January) and I just start to use LuxRender. Before LuxRender, all my renders were run with 3Delight (biased rendering).
This afternoom I played a long time with the different parameters of LuxRender (I found a lot of informations in the wiki) but I don't understand how to use the noise reduction, I don't foun any information for the GREYCStoration use.
All parameters are thoroughly explained in GREYCstoration guide, however you rarely need to tweak settings, the defaults are quite optimal. On the other hand, GREYCstoration processing is extremely slow. From my own experience, you can achieve similar (if not better) results much, much faster with Wavelet Denoise GIMP plugin.