LightWave-Radiance OBJ question

Users of LightWave and those in the know,

I have noticed that exporting an object from LightWave (.lwo) to WaveFront OBJ format yields a .obj file that does not specify the surface normals ("vn"). I can actually bring the .obj file into Poser and then re-export it as an .obj and, voila, the surface normals are included. Anyone know what tweaks can be done or options can be exercised within LightWave to export objects in .obj format with surface normals ("vn") listed in the file? This is helpful when trying to use the obj2rad command and the -s option with obj2mesh for smoothing purposes.