theres an old mod using nail varnish i used it on one of my old pink/red cathodes to give it more of a red glow instead of pink or you could put some tracing paper around it as that would dim it
i made mine duller by putting the cathode in some of that "cable tidy" spiral stuff(black). its got slots in it so just the right amount of light comes through
It probably is possible to do it thru electronic means, but those things run mega high voltage (over 500v) and are dangerous! Stick to tape or whatever you can find.
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