I thought a few folks might find this article at least a little interesting (even if it's not the most scientific).
https://www.sweetwater.com/insync/what-is-lufs-and-why-should-i-care/?utm_content=article2-button&utm_source=insync&utm_medium=email&utm_campaign=20181117
https://www.sweetwater.com/insync/what-is-lufs-and-why-should-i-care/
same link, without unnecessary tracking