Light Fog Shape - Maya

No.538421 ViewReplyOriginalReport
I need your help guys.
So I have this scene with street lights, and I want them to have a light fog cone like in the image.
The problem is that the fog cone is not the same shape as the light cone. Is there any way to fix that? I can't find any way of changing the shape or scale of just the fog shape. They both transform at the same time.

I'm using Spot Lights with Light Fog activaded under Light Effects and mental ray to render.

I would really appreciate any kind of help here cause I can't find any tutorials about this issue.
Thanks in advance