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Dimming ballasts are available for fluorescent tubes and CFLs that use an external ballast. These ballasts are usually rapid start or programmed start, and have a good dimming range.
Dimming fluorescent lights are usually found in commercial and institutional environments and not common in the household.
Since dimmable fluorescent tubes are wired in series, they use non-shunted lampholders.
See Series Ballast Lampholder Wiring page for more information.
Using Advance Mark 7 or Mark 10 dimming ballast and dimmer switch
2 lamp series ballast wiring.
3 lamp series-parallel ballast wiring.