The thread where I fully demonstrate the behavior of the Translucence channel is here:

http://www.runtimedna.com/forum/showthread.php?t=26024&highlight=translucence&page=2

It is extremely esoteric and unless you're willing to read every word and build a pretty complete model in your head about what to expect versus what I demonstrate, you can just skip to my conclusion. (Stefan should ready it very thoroughly, though.)

Conclusion - the translucence either acts ordinary (like ambient) or does something that isn't very useful. In addition, there are situations where it doesn't even do its intended behavior for a completely meaningless reason. There should be no distinction between using two identical but separate Diffuse nodes versus using the same node for two channels.

I say stay away from it.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)