I'm not sure what you mean by the "ray trace shader node" - are you thinking of Poser? Oops, I meant the advanced surfaces tab. Been playin in Eilir again.

Not true. the renderer needs to be set to ray trace (that is, 3Delight rather than OpenGL) but the lights don't require any particular settings.

Well, ok, that's true enough, but if TrickE76 wants shadows he at least needs to set the light parameter to shadow mapping. I recommended raytracing out of habit, as I use it exclusively.