> What I forgot: I turned on radiosity as yoou mentioned but without a light
> source the image was black, except for the emitters (if using a black
> background). Why is that?
> 

By default, radiosity don't get any illumination from medias. You need 
to add "media on" in your radiosity block to enable illumination 
computation from medias.

radiosity{media on}

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