Ballasts, invisible inside the fixture, are required for all fluorescent pin-base bulbs to operate. Ballasts modify the line voltage they are connected to (120V, 277V, etc) so the proper current is supplied to the bulb. Because ballasts are hidden, it is easy to assume the bulbs are simply operated directly off line voltage. Not so, the voltage at the CFL socket needs to be regulated. That is the job of the ballast.
The answer to our question is now clear. The voltage of a CFL light bulb is irrelevant for the consumer who is simply buying a replacement bulb. The ballast in the fixture takes care of it.
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