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I suppose one could export finished scenes via PoseRay. Not sure if that would do much good for LuxRender, but I understand it does sort-of provide some sort of bridge to Blender. Mind you, all this is a total grey area for me. Grey, as in: charcoal.

In the interest of wheel reinvention prevention, I think it may indeed be a good idea to have a look at PoseRay. I have to confess I don't know much about it. Is it open source? What language is it written in? Since it can export to various formats, I'm assuming there must be a decent exporting API, and it would be feasible to add an exporter for Lux. Probably still a lot of work, though.

-- I'm not mad at you, just Westphalian.