I thought an interesting move for the next Light Phone is to dedicate an entire knob to screen brightness [0], although they indicate it will be user programmable too.

https://www.thelightphone.com/blog/light-iii-design-manifest...

My previous phone had a scheduled "night time mood" which put the display into greyscale. Without this there's an intensity to the screen that reducing the brightness doesn't fix.

Calm tech isn't about nit levels. It's about how much the tech inserts itself into your attention.

I doubt those are the uncalming aspects of tablets and phones, sure they’re what keep you up at night on a physical level but not mentally.