Well that failed because it is still doing the same thing, very quickly changing from low brightness to high brightness. There is no smooth or slow transition like the setting should enforce, it is just an instant change.
I do have the current colour set to 1200K Ember. I do also use the Adjust day and night colours together and it is set to 1200K but do not know whether that makes any difference.
My main concern is with making my computer usable and comfortable to use. I do use browser extensions (Dark Background & White Text) to eliminate white page backgrounds. Most in the CFS/ME/Fibro community have this problem and a shifted body clock and some also have sleeping difficulties.