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Interesting. What wouldn't be usually dimmable?

Normally equipment that's still in development or is bought off the shelf[1]. Power LEDs on a laptop charger for example.

> Power LEDs on a laptop charger for example.

...Oh, right. The things under the electrical tape patch on my laptop :D

Yeah, probably a bad example. A screen on a laptop that nobody has admin rights on to properly dim might be a better case.