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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.

2 Lamp Dimming Ballast Wiring Diagram

Dimming Ballast Wiring

Dimming Ballast Wiring Diagrams

2 Lamp Dimming Ballast Wiring Diagram

Using Advance Mark 7 or Mark 10 dimming ballast and dimmer switch

2 lamp series ballast wiring.

3 Lamp Dimming Ballast Wiring Diagram

Using Advance Mark 7 or Mark 10 dimming ballast and dimmer switch

3 lamp series-parallel ballast wiring.

3 Lamp Dimming Ballast Wiring Diagram

Fluorescent Ballasts

Ballast Wiring

Parallel Ballast Wiring

Series Ballast Wiring 1 to 3 Lamps

Series Ballast Wiring 4 Lamps

Dimming Ballast Wiring

CFL Ballast Wiring

Emergency Ballasts

Fluorescent Lampholders

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