Extrude some tubing in a modeler (Silo is my first choice).

     The main extrusion would be the visible "neon".

     Nested just slightly inside would be an IDL emitter extrusion.  Uncheck visible in camera, and text-edit the prop file to set visible in reflection to zero.  This mesh will have intense ambient (7?  70?)

     Make a third extrusion along the same path, but with a diameter about 2.5 times that of the neon.  This third extrusion will be the glow aura, and use the double edge blend method of texturing. 

  

Poser 12, Poser 13, Poser 14, in feet.  

OSes:  Win7Prox64, Win7Ultx64, Win11

Silo Pro 2.5.6 64bit, Silo 2025.1, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5