This has probably been asked before, but which would render quicker: having bright vray lights in your scene and a ‘normal’ vraycamera speed/iso combination or relatively dim lights and a slower shutter speed/higher iso setting?
Mmmmm? :roll:
definitely the second.
If what happens for sun and sky happens for normal lights.
EDIT: i talk rubbish, as per usual.
It’s a lot faster to actually dim the diffuse coefficient on materials, whatever the lighting/exposure is 
Have a look at the tutorial on sun sky and physcam to check for yourself…
Lele