Did you refract the glow? If so, it may not work on semi-transparent objects. :shrug:
Well, the glow is actually part of the light fixture and I have tried it with both the fixture being refracted and not. Doesn't seem to make a difference either way. I'm assuming the glow is part of the "glow map" of the fixture, but not sure.
Well, the "glow" is not from a glow map and I can't figure out how it is attached to the fixture. Maybe I'll have to try another fixture where you can't see the light so it looks more natural.