That's weird: My post + pic didn't appear. Must have timed-out...

Okay, thank you, thank you, I got 'Emission' to work. 

First part of problem was it took me best part of an hour to find the referenced nodes. Needs alphabetical lists, directory and map.

Second, only lit at render.

Upside, I've learned something today.

Downside, I'm going to be plagued by umpteen revenant trial-renders that won't stay deleted...

Again, thank you.