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Hi Brad,

Correction to my original post where I said:
"The other LED I tried was a 485nM one I just got."
I meant so say:
"The other LED I tried was a 385nM one I just got."

385nM is considered purple/UV by the LED folks. It isn't that far into the
UV so it still has some visible light coming out of it. It looked a not so
bright white to my eye. The first LED was 394nM which is only 10nM apart on
the spectrum but it was listed as very bright. It looked to be bright blue
to my eye. The brightness might have had more effect on the CRTs than the
difference in wavelength.

I also tried an IR LED. It was unimpressive. I did not try red, green,
orange or yellow LEDs. There are just too many combinations of LEDs, CRTs,
phosphors, and who knows what else, affecting the results.

Based on my seat-of-the-pants experiment this is a promising idea. In the
end, I doubt that there will be a single LED that works for all CRTs. I
encountered far too many variables to reach a definitive conclusion. More
experimentation with different LEDs and different CRTs is needed. I think
the least of the problems will be where to place the LEDs.

Dennis