Found it.
Parameter (l)user_error was set to "ON".   :\

Reading too fast, seeing what I wanted to see, and missing a translate
directive.
(This isn't the first time I've aborted a post because in the middle of trying
to explain what the problem, the error and bleedingly obvious solution jumped
out of the screen and gave my grey matter a good swift kick in the medulla
oblongata...)

Any quick-start tips on dealing with filtered light?
The red I had was WAY too red, maybe the yellow I'm trying now has potential is
I get the filter value right.
I'd like some sort of glow to emanate from the center of the cones without
blasting the rest of the scene with light.
I'm guessing that with radiosity turned on, I need EMISSION in the finish{}
block.

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