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Joshua mentioned "Dimmable Ballasts" and it seemed to confuse you. Virtually all flourescent fixtures have a transformer in them. This is refered to as the "ballast". I guess because some look a lot like some of the ballast stones used in ancient sailing ships, sort of brick shaped. The ballasts that have dimming capability are designed to keep the bulb lit as the input voltage goes down, only with less light output.. They usually are of the electronic type. Bulbs that allow this without ballast change are new to me.
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