I was using light cache primary and dmc as secondary and
got a almost perfect result, but there was some noise in the picture and i wanted a noise free result as i said in the other post.
I used the irrad as primary and dmc as secondary and some things changed and there were some weir things that happened to the lights. I cant seem to get it right.
Any help is appreciated
Re: materials changed when i used irrad for primary render
Difficult to see what you mean - but generaly I would use IM+LC. The light cache is one of the greatest features of Vray. I would say, for interiors it help to get the right light distributation.
PS: I would open the starterkit from the tutorial section, save the option file from it and load it to your scene. Than you should get a good basic setup. Than play with the IM subdivs to avoid the splotches.