Quote - I got brave and gave it a go. After 3 hours I decided this was finished enough. I have no clue what's up with the hair. It looks like some textures didn't export correctly.

Could it be your hair uses a Blinn node with a texture plugged in?
Since LuxPose recognizes and exports Blinn nodes, but doesn't plug anything into them, you get an unadulterated, almost metallic highlight.

(I think the best/safer solution for now (till advanced material translation is added) is to fall back to P4 times materials (edit all your materials before export, get rid of all advanced stuff), and to do the advanced magic by hand, editing the .lxm files. It's a pain, but it's easier than it looks like.)

You can get rid of the light ring on the floor by changing your filter (render settings) to gaussian, it's a Mitchell filter overreaction.