I would go for a .df3 media derived from the object and contained in
another, hollow and transparent, copy of the object . If your object is
(mostly) convex, then scaling the media + container down a bit will account
for an internal glow (neon tube type), and vice versa, scaling the media +
container up a little will render an external glow, like the effect of those
UV neon bulbs in disco clubs.

Peter

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