ok, i think my question was either misinterpreted or not fully understood.

right now, most people are not using IDL.  by far, more people are still using IBL alone to fake indirect lighting.  but LuxRenderer already computes indirect lighting.  so most IBL lights used with real indirect lighting might blow out the scene because they're designed to compensate for its absence.

for your basic outdoor scene in Poser, you might have an infinite for the sun and an IBL for the light from the ground, sky, and surrounding  props.  but in something that calculates actual indirect lighting, i'd only need IBL for what isn't actually there.  sure, if it's a closed box, the light light from the IBL won't get in.  and if something's right next to something else or really big, the only light will be the correct reflected light.  but if the spacing is greater, the space isn't enclosed, or the item is smaller, then what you're going to have is indirect light supplemented by IBL in an unrealistic way.

now maybe i'm wrong and this isn't an issue at all.  but renders being too bright were a problem with a lot of people's first attempts with IDL. 

not to mention, when IBL is used only to fake indirect light from surrounding items (which is true of a lot of studio style renders and indoor renders in general), it's just wasted information.

i wanted to know if anyone had any solutions or general advice about how to handle the lighting adjustment, especially considering you might want to retain the original lighting for Firefly. if there's not, that's cool.  it sounds like it hasn't really been considered yet.   but i wasn't wondering whether IBLs existed in Luxrender. it would actually be better for about 99% of my renders if they weren't brought over.