Does anyone know what the objFile in a spotlight is for?

i.e.

light spotLight 1
        {
        storageOffset 0 0.3487 0
        objFileGeom 0 0 :Runtime:geometries:lights:spotLite.obj
        }

Beforer any random speculation occurs, let me explain what I've already done investigating this:

I've created two new objects and tried them. I tried a bullseye-lantern shape and a wide open o-ring. I was thinking that it might be possible to make a geometry that would allow me to create an omnidirectional light in Poser, because that would just be really cool.

• There is no difference in the shape of the light that's cast
• There is no difference in the sharpness of the shadow.
• There is no difference in the angle
• There is no difference even in the preview shown -- the preview still shows spotLite.obj regardless of the objFile I point it at.
• No RSR file is created.
• Rendering with three spotlights with all three objFiles represented and otherwise identical settings creates identical images (checked down to the pixel level by layering in Difference mode in Photoshop, shows all black, thus not a single pixel of difference).

If there is no difference in effect, why, in fact, does it point to an objFile at all? There doesn't seem to be any reason I can see, and it doesn't use the objFile to create the lights (I haven't tried replacing the objFile directly to see if there is a change that way, but that would be an unwieldy way to work as you would have to replace the objFile each time you wanted to make a new light, and since RSRs lock, you could not use more than one in a scene (or even Poser session).

So, does anyone know more about this mystery than I?