Brightness & Saturation - unable to setup darker night and retaining a normal bright day

[birdspider]

Maybe I do not understand the options but regardless what I tweak i get either a sufficently dark night - which results in a darkish day, or in a rather bright night (navigation without torch is easy)

Could it be that SUN_LIGHT_LEVEL is the same value for Sun and Moon ?

also whats the difference between these:

option.SKY_LIGHT_LEVEL=Sky Light Level
option.SKY_LIGHT_LEVEL.comment=The brightness level of skylight

option.SKY_BRIGHTNESS=Sky Brightness
option.SKY_BRIGHTNESS.comment=The brightness level of the sky