Can you change the shape of the halo cone?

Hi all,

Can anyone tell me if it’s possible to change the shape of the base of the halo cone emitted by a spot light from flat to sperical? If you look at my picture attached you can see that the halo light coming out of the pot finishes flat (horizontal), where I want it to finish spherical based on a radius from the point of the light source.

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i do not think this is possible with blender.
i would round the light cone in photoshop
and than compose the coins over it.

tilt the spot toward the camera. It will be more diffuse, you will be looking at the edge of the cone of light which will appear circular/spherical.

Thanks, I can’t really create the light in another program as I’m using the volumetric shadows from the coins to create ‘lines’ in the light. This is a still from an animation.