> No dice.  I tried the light_group trick, and either the media box blocks 
> the
> light coming from the prism; or when I put the prism/light emitter/plane 
> in
> a group, it disables photon mapping, which gets rid of the rainbow effect.

For alpha transparency to have any effect you need to be looking at
the background and not a solid plane.  Comment that out and then
you can layer your glow image over the other image with the text and
prism.

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