POV-Ray [plugin] (updated: 2016/Aug/08)

[micheus]

Edit2: Just digested your last part, about media. I never used media, but you may have hit the nail on the head. (Slight doubts about reflection, still.)

I think that we need to be sure about what we get in this scene.
They can suggest this one: Neon Tubes (Anyone can tell me how to make them emit light)(check the links for images)
Yeah, I had already looked for it these days.

Just in case you don't know it (and it's good for oort), I would like present "the state of the art" of POV-Ray tutorials: Descriptions and Examples for the POV-Ray Raytracer by Friedrich A. Lohmueller

I believe the the answer for this example is this one: Light Sword
with Emitting Media

[Edit 1]: Did you talk something about ambient occlusion?
Ah! I have a link about this too: Ambient Occlusion Test

[Edit 2]: I still need to answer oort's questions