pfx_night 0 0 128.000000 1.000000 1.254900 10.000000 2.000000 1.784300 1.215700 0.000000 2.980400 2.980400 1.529400 1.000000
module_postfx.py
# Each postfx_param contains the following fields:
# 1) id (string):
# 2) flags (int).
# 3) tonemap operator type (0,1,2,3)
# 4) shader parameters1 [ HDRRange, HDRExposureScaler, LuminanceAverageScaler, LuminanceMaxScaler ]
# 5) shader parameters2 [ BrightpassTreshold, BrightpassPostPower, BlurStrenght, BlurAmount ]
# 6) shader parameters3 [ AmbientColorCoef, SunColorCoef, SpecularCoef, -reserved ]
two parameters that mainly affect the lighting: AmbientColorCoef, SunColorCoef
for night SunColorCoef = 0.000000 so therefore, the lighting is regulated by AmbientColorCoef
I use
pfx_night 0 0 128.000000 1.000000 1.254900 10.000000 2.000000 1.784300 1.215700 0.000000
0.160000 0.000000 0.800000 1.000000
but these are very dark nights
but it is also worth considering that this value also depends on the texture of the night sky