ok, this might be a dumb question, but...

let's say i want to do an indoor scene, and not from a photo.  this tool, wonderfully, solves the problem i always had with IBL, which is that i'm only interested in  CG scenes.  but i'm wondering about the initial lighting.  should it just be the directional lights?  should it be the directional lights with a dim white IBL?  or should i try to approximate the colors of the scene?  or does it not matter, because of how the tool works?

i haven't tried it yet, because i haven't needed to (i like plain backgrounds and empty scenes, actually), but i think i'll be wanting to have some fun with it soon.