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un- +‎ dimmable


undimmable (not comparable)

  1. Not capable of being dimmed.
    • 2009 September 25, Eric A. Taub, “Build a Better Bulb for a $10 Million Prize”, in New York Times[1]:
      Consumers rebelled against the bulbs’ shortcomings: the light output from compact fluorescent bulbs was cold and unpleasant, their life was much shorter than claimed, many were large and undimmable, they would not work in cold environments and they contained polluting mercury.