Able to be dimmed; able to have illumination decreased in brightness.(adjective)
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Use "dimmable" in a sentence
"Note also that while patents on compact fluorescents have mostly expired, Philips still has the patents on compact fluorescents that are "dimmable" (that is, can be used in combination with conventional light dimmers.)"
"The LED light bulb fits 5 and 6-inch light fixtures and is completely dimmable, meaning you can replace the usual bulbs you use with a set of these Klipsch ones, which will last for"
"Either the thing is so high tech you can't figure out how to put on some tunes, or so low tech that its non-dimmable LED lights keep you up at night."