how to decipher ENB Settings..

I love this.. but I think my shadow is a bit dark.. what settings do I use to lighten it up a bit?

I don't know the difference between the shadowamountday vs shadowscreenlevel etc..

[sHADOW]

ShadowFadeStart=40

ShadowFadeEnd=80

ShadowAmountDay=100

ShadowAmountNight=30

ShadowScreenLevelDay=60

ShadowScreenLevelNight=20

ShadowQuality=2

UseShadowFilter=0

FilterQuality=2

ShadowBlurRange=30