tough interior scene very noisy..

yes you're right. As we had some login troubles 2 weeks ago (due finally to smtp issue on server) i was forced to set off the antispam to allow account creations... but had LOT of spam in forum... now it's clean.
i'm impatient to see your results.

ouch..
There's soo many lights in your scene...
maybe you can try with an invisble light snake, but i guess result will be more or less identical
i'm puzzled you were forced to use the interior dark preset. There's enough light to use only the interior.
are you using a vray dome at this moment ?

Actually SR presets are "thinked" for still renderings.
AA will not be sufficient if you plan to add Moblur.
I suggest to open the info panel of solidrocks and check that you have something like AA max 9 if you want decent Moblur and/or DOF.
i just received your scene, will try to have a look today.

ok i played a bit with your unusually long light and corridor...
the grain comes because light cover huge distance and need more sampling.
what you can do is :

- set in interior settings. good mode should be enough.
- into SR options, uncheck the "Auto VrayShadows subdivs"
- then, set manually the subdivs of your light to 16

result is much more decent.

optimisation suggestions :
- divide your veeeeeeery long light into 4 lights(at least), each covering a quarter of the total section. it may help to reduce noise/gain rendertime. the cutoff will help to not compute light wich is far away from camera.
- If you use Motion Blur, like in camera2, be aware that Moblur and DOF are manager by AA. So you'll need to edit the preset and raise the AAmax to get at least 9 AA subdivs to remove grain coming from motion blur.
You can tweak precisely using the "info" panel of SR.

Hope it helps !

you're very welcome.
Hope it help !

the dark interior have more or less the same grain at rendertime, but improves the GI quality