I took the easy route, knowing there was a low probability of success. I ordered a T9 LED light what would be an almost drop in replacement for the tube and "electronic ballast" (aka switch mode power supply) in my now-disassembled bench lamp. It arrived tonight and, indeed, it would be an easy replacement. It even came with clips to hold the light in the fixture.
Alas, here's what I saw when I hooked power up to it (before putting it in the fixture):
That's a 0.5V pp signal. Yes, that's not a typo. 0.5V pp. My scope probe is picking that much signal up when it is six inches away from the light.
I can hear it on radios a hundred feet away. I am sure, if I cared to run the experiment, I could hear it on radios a thousand feet away. I promptly boxed it up and returned it for a refund, after leaving a review on amazon (complete with photos). I didn't open it up but it is a safe bet that
if provisions were made for filters - they probably were because that's how the game is played - any components actually required for that function were left off the board to save money.
Back to the drawing board. Its too bad, too, because that bugger was
bright!