The mod seems to work but with the examples provided in the curseforge page it seems like the value given to the command defines the max level mobs CAN spawn at. But in the game its different:

How it should be(based on examples):
Like mobSpawningLightLevel 1 for ONLY 1 to 0
or mobSpawningLightLevel 0 for ONLY 0.

What happens instead:
For instance mobSpawningLightLevel 1 does nothing for light level 1, only spawn at level 0.
And for mobSpawningLightLevel 0 no mobs spawn at all.

It seems the value is more of the minimum level they CANT spawn at.
This seems easy to fix but before doing so, being able to stop all spawns seems helpful(sometimes people dont want to peaceful switch)
so what if -1 stopped all spawns or just keep as is and change the examples on curseforge.

My testing setup.