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That's surprisingly low. I would have expected much higher since I have been told that a bedside dimmer light is a US custom. It isn't a UK one at all as far as I know.

I'm in the UK, and I would guess that it is even lower here - close to non-existent outside of smart-home and IoT enthusiasts, and US expatriates.

Would you mind providing a link to your study?

We never published it (just internal market research), but that result was based on about 500 responses. We controlled for the typical demographics.

Do those "dimmers" with under 5% use include the ones with only 3 levels? I thought those were common?

You're referring to 3-way, I think. I think most people would classify that as a dimmer.