Artificial light intensity vs natural light

[fraggle]

that may be an answer regarding vraylightmatl (instead of selfillu):
http://forums.chaosgroup.com/showthread.php?82935-Override-material-exclude-material-instead-of-object/page3

@Duv

Thank you Matt this table looks great i already put it on the wall !
In the previous century : ) is used to buy 400 iso to 1600 iso film for interiors depending on the lighting conditions … There was no way that you could capture a dark interior in a 200 iso film. Never used flash in my entire life!
I have to say that I still find all these settings a bit of an anachronism in DSLRs and in Vray. You don’t have silver crystals in film because there is no film.
You shoot ‘gigapixels’ you touch your point you focus and from time to time you adjust the exposure if the setting is unusual or you want to darken it or to burn the shot. Rule of thumb for me is to do that in post-processing and capture as much information as possible.
From my point of view there is only exposure and geography. The ideal workflow for my type of work would have been to have an exposure 1 is something like midday, summer 30th parallel north and south. So you set up time - day - place - atmosphere you define north in your drawing. Automatically you have a suggested exposure. Mental ray tried that and it wasn’t that bad. The feature that would make my life much easier though would have been to have light materials, multi- sub object self illuminated materials and vray lights to behave the same way. All being displayed in the light lister with three quality presets. When i usually break my scene is with self illuminating materials. Small peculiar led strips, led walls with frosted effect, video projections, colour printed lightboxes . Things change so quickly as we design that spending time turning multi-subobject material meshes to lights becomes a no go. So i usually fiddle with it until it looks right and after a while I start using all sort of values that have nothing to do with reality. In the middle of this mess a light designer comes in and starts throwing light fittings in lumens …