as ment abv, poser can set diffuse/specular color separately for lites in material room.  somebody may wish to set spec=black or diff=black on a poser lite, then see if carrara imports the lite correctly.

for black spec, poser exports "KsColor 0.0 0.0 0.0 1" and/or

nodeInput "Specular"
                    {
                    name "Specular"
                    value 0 0 0

 carrara may or may not be able to read nodes for poser lites.