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Some fluorescent lamps (bulbs) can be dimmed, but they must be designed to be dimmable. The ballasts and electronics that drive the bulb have to be designed to work with a dimmer or they will not function properly and may overheat.

When dimming fluorescent bulbs, many can't be faded smoothly from full to zero. Some will only go to a minimum like 5-20%.

A dimmable compact fluorescent lamp will be labelled as being dimmble and can be connected to an ordinary dimmer. For tubes, the ballast has to be specailly designed to be dimmable.

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13y ago
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16y ago

Incandescent can be used with a dimer switch. Flourscent lamps, unless designed to be dimmable, cannot due to the ballast needed.

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Q: Why can't you dim fluorescent light bulbs?
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