So in my map I have the sun set to default_day ssi and I want to keep it that way so it is light outside. However I have one part of my map that is underground so I want it to appear very dark with the exception of the lights of course.

My problem is that when the sun is set to day it affects how light it is inside which doesn't really make sense because it is indoors.

Is there any way to fix this so the light inside isn't affected by the sun?