NOT SUPPORTING VANILLA You can turn and adjust the darkness level on interiors and night opening the GUI menu (shift+Enter) enbeffect window (see the picture below) remember at the end to save (based enb on 1.5, NAT version is better on 0.5) ...
my computer has to really pull its weight to render my Wasteland again. But if anyone launched me into action to try and tweak my own version of a Fallout ENB, it was trillville. I thank you for not only thinking immediately that what works for F:NV could also be expected to work ...