If I understand the original question: When you make a visible, volumetric light, you are making the light itself into a "real" object, so that the radial light can affect it, just as it does the other visible objects in your scene, like the squashed cube and plane in the image at the top of this thread. Although you can change the look of this by adjusting the "edge softness" or intensity of the spotlight, I'm not sure you can get the exact effect you are after. Hope this helps.

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