I want to add that version 3.3.1 of the Home app seems to be better than 3.5.1, because the latter has problems with low CRI lights.
See here: Opple Light Master 4 discussion thread (new 2023 model) - #749 by Limsup
And also on Reddit: https://old.reddit.com/r/flashlight/comments/18ys0fk/opple_home_app_not_showing_r_values/
Both posts talk about version 3.5.1, released around Dec 29, 2023.
So I’d say that for now Home app version 3.3.1 is the recommended one. It was released on Oct 14, 2023 for iOS and on Dec 12, 2023 for Android.
But it’s interesting to compare it to Smart app version 3.5.1 (released on Dec 8, 2023), since it would much easier for me to modify it further.