Watch Battery lvl on iPhone lock screen works

https://preview.redd.it/q3h4r4cdo70c1.jpeg?width=1179&format=pjpg&auto=webp&s=6c08ef6148e0cc152042a5a715a413a7e5d66b31

You definitely can! I have 1 for sunrise and sunset(at anytime really)

https://preview.redd.it/qls58wfco70c1.jpeg?width=1179&format=pjpg&auto=webp&s=b3d11c04b0834453954526bd5be570e8f898090f

You can also use your location to change your watch face. For eg. at work and etc

I use automations and shortcuts to change watch faces

I use infograph to show 8 complications during the day and a simple face for nighttime

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