so this part is that the lighting is different each night and with new moon it at it darkest. and i don't think that at new moon stage that it should not be at light level 4.

Curse forge of mod (before overwolf transfer)
https://www.curseforge.com/minecraft/mc-mods/true-darkness

There are now mod config settings in DS to change the DS sky light levels based on moon phase and day / night (per dimension) in version 1.12.2.116

It's an interesting concept, but that mod is a client-side-only mod. It doesn't have systems or data server-side, so it cannot be used to alter stealth levels.

The general idea is interesting though, and could probably be done server-side. I might make such a mod sometime if nobody else already has, but I don't have an ETA (depends on my other projects and how complex it ends up being).

Leaving this open for now.

It uses the moon phase and time of day, which are already synced in vanilla. It takes that information and, on the client side, uses a shader to change how bright things look on your screen (but not how bright things are for game mechanics)

ok sound good

wonder how it is sync on servers then

that sound understandable. im kinda going to stop using it for now.

just realise that i put the wrong link to a mod i was using. but it dose the same thing

https://www.curseforge.com/minecraft/mc-mods/dynamic-darkness

WELP