Per Allodoxaphobia:
Just rip open a couple of those failed CFLs you have.
There's a 15 or 20uF 200V capacitor in each one.

That begs a question from somebody who has no clue electric-wise: Is
the voltage of a capacitor just a capacity limit? i.e. can a 100v
capacitor be replaced with a 300v capacitor with no problem?

I'm guessing the capacity in microfarads is critical. i.e. a 15uF cap
cannot be replaced by a 30uF cap.
--
Pete Cresswell