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I found some dimmable CFLs (compact fluorescent lights) on Google. However, while not recommended and this comes with no warranty implied, you can dim a standard fluorescent down to about 50% brightness. You just have to turn it full on first and then dim it down. Beyond half brightness, you risk damaging the dimmer because they're not designed to work with an inductive load like a ballast transformer. There are special dimmers called variacs that work with fluorescents.