If enough microwave energy were leaking to be dangerous, then YES, it
would definitely glow somewhat.
It doesn't take much RF to energize a flourescent tube. However, since
the amount that leaks from a microwave is usually quite small, the tube
may not light (or you may need to turn out ALL the lights to see it)
Ned Flat: "Why are you acting like this??"
Yakko: "We're not acting. We really are like this."
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