@DarcyThomas Interesting question. Have a look at this site. I took particular note of this comment, "Thus the typical switch-on behavior ... is that it gives a feeble steady light initially (no flickering) and then switches to full brightness about 1s later." So this does seem kind of slow. The author is discussing a different tube design, though. Have you taken a measurement about how long it takes, yourself? It makes me wonder about multiplexing and I'm now curious.
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