Thanks, Alan.

Yes, the strength of the light must have been the problem: I tried
scattering, but got only a black screen. i couldn't explain it to
myself, and that was one of the reasons why I redesigned the
illumination of my scene and removed all light sources 8and use now a
long, emitting bar with radiosity).

I think, I will make one more try with the scattering, as it sound
promising. :-)

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On 13.02.2016 16:15, Alain wrote:
> Your light need to be fading.
> That mean using fade_power 2 and fade_distance SomeRelativelyShortDistance.
> That also mean that the light's intensity will large to very large,
> possibly in the 1000000 range.
> 
> That wat, the illumination will be much stronger near the lights, making
> it right for scattering media. Just make the media have a blue colour.
> It will glow blue, and the illumination reatching the surface will get a
> yellow tint.
> Also, that scattering media will gives a blue tint to things farther away.
> 
> If you use radiosity and emissive image/pattern, that can't illuminate
> your media. In that case, you'll need to use emissive media to get the
> same result.

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