HN plays really nice with Dark Reader, I've been using it for years.

https://darkreader.org/

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HN is feature minimalist. The beauty is you can skin it in any number of ways due to its simple design and it’s hackable. Firefox on iOS has a dark mode and HN appears dark when you visit it. I’m really liking it since blue light damages the eyes.

Last time I checked, there was no consensus on the damage you can avoid by using dark mode.

It’s an accessibility thing. I don’t like the discomfort of shining what is effectively a torch into my eyes as I read. Maybe there’s no research but it’s essentially a preference.

Instead of dark mode you can change the brightness of your screen.

wonder what is percentage of people are using dark mode with system and apps ... somehow, I don't feel it is good/easy for eyes, and harder to read with dark mode at day time.

I read it almost exclusively via Safari in dark mode using the Noir extension on desktop and mobile. HN is a very simple site to invert.