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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
Standard 2 lamp series ballast wiring.
3 lamp series-parallel ballast wiring.
Parallel Ballast Wiring
Series Ballast Wiring 1 to 3 Lamps
Series Ballast Wiring 4 Lamps
Dimming Ballast Wiring
CFL Ballast Wiring
Fluorescent Lampholder Wiring
Parallel Ballast Lampholder Wiring
Series Ballast Lampholder Wiring 2 and 4 Lamps
Series Ballast Lampholder Wiring 3 Lamps
Swap Terminals on Non-Shunted Lampholders