Square lamp shade with its surrounding aura (note smoothed shape of aura), and a lightbulb with surrounding aura, which follows the shape fairly closely because it's already rounded:

.     .

     In both cases I did not show the emitter mesh, because the emitter would simply be a "shrinkwrap" overlaid onto the visible prop.  The aura mesh seems large, but the "glow" you'll see when rendered will only extend out about half the distance of the mesh.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

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