“the Apple Watch Ultra 2’s screen also gets dimmer than the first watch, going down to just one nit when you have the watch in sleep mode. It can also get that dim if the screen isn’t active and you’re in a really dark room. The ambient light sensor adjusts the brightness depending on the situation.”

Wtf is that symbol you wrote over the watch on the left?

Ultra 2 may be in the always on display which is dimmer until raised to save battery

The biggest and brightest Apple Watch display ever. Powered by the all-new S9 SiP, the Always‑On Retina display is 3000 nits at its peak, making it even more readable in harsh sunlight.

— In low-light situations, it dims to 1 nit.

—

It is dimmer making it hard to see what’s on the screen with old eyes. And there’s nothing you can do about it but hope (https://www.apple.com/feedback/watch/) they make it possible to disable the ambient light sensor and set the brightness manually.

This is a called the 1nit feature. The intention of this is to prevent distractions in completely dark ambient environments.

Both can go as low as 1 nit if I am not mistaken. But maybe the ultra can go into lower frequency as well

That’s actually a good battery saving feature when asleep

Its a feature

Why do you want a bright display in a dark room? Be happy it’s darker when it needs to be