This mod makes it so that, during the day, with different light levels you get different regeneration speeds, all silently and swiftly, making it seem like a deeply-incorporated game mechanic.

If you use a version of the mod "Scion - a Vampire Overhaul" prior to v2.0, you need to install this additional file too.
Scion v2.0+ is natively compatible with the main file of my mod.
This "patch" for Scion was made and kindly shared by Vivenmort.