[Light]
fLightEnableDisableFadeTime
fLightEnableDisableFadeTime along with the [Light] section was added in the official 1.6 patch, which introduced Dawnguard compatibility. Therefore, it is presumed to be related to the vampires' sun allergy.
Default is 1.
fLightEnableDisableFadeTime=(...,-0.0001,0,0.0001,...)