> The filament texture looks black because you specified a black texture.
> "Glossy" is a finish with some highlights and reflection, neither of
> which would be very visible on a glowing filament, and you didn't
> specify a pigment, so it used the default black pigment.
> What you want to do is specify a white pigment for your texture and an
> ambient value of 1 in the finish.
>
> This will make your filament brightly lit, but if you look at a glowing
> filament in real life you will see a halo around it from scattering in
> the air between you and the filament and in the eye. This is what the
> talk of media or glow is about.

Thanks Chris,
  Between yourself and Chris' response I have solved the black cylinder
problem and realise I need to keep working through the tutorial to get a
more realistic look. I was being mislead by the looks_like command, taking
it at face value in expecting the light source to look like the object. As
for the texture, I realise now that it did not include a pigment, it was my
umpteenth attempt at getting the texture right with what I had read about at
that time, I was getting a little frustrated 8).

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