First of all thanks for the shaders and also for your time reading this , which I know is valuable (your time, not my post)

BACKGROUND
Some mods like enhanced celestials change the color of the moon, and in vanilla also changes the general hue of the night light

SUMMARY
Will be a really nice touch if the shaders could have a parameter to replicate that vanilla lightning change. Could be done maybe reading that vanilla light tone, or liek we have water color influenced by biome, night ligt influenced by moon sprite hue?

MORE DETAILS
I know there is a mod in progress to add that compatibility but is not working with cumplimentary (Enhanced Celestials Shader Support) , but would be nice if the shadder itself could control that,so it can be adjusted, just a little red hue in blood moon, or everythign red if someone likes it for a dramatic effect.
I know using reimagined moon at least that the enhanced celestial mod is able to change the color of the moon, so the shaders are able to be influenced by the moon state changes.

Unfortunate we don't have any information about this. Enhanced celestials would have to inject into iris and add new uniforms we can use on the shader side. No way to detect what they are doing on our side.
Also the Enhanced Celestials Shader Support mod just has compile issues and isn't great at all causing crashes as well. It injects into shaders and just causes issues. I don't recommend anyone using that mod. Doesn't even seem to be maintained anymore

Im working on a personal fork of enhanced celestials and also updating manually the shaders to achieve this, if I can make it work (Im near) I will share it.