Add dark areas to the map for survivors and increase brightness for killers.
Ok this would actually make the game more tense and hard to do like add a darkness area of the map that has some generators that have to be completed. Fov and brightness is reduced this would actually make a place in the map unsafe for survivors which right now everything is safe for survivors. Flashlight will be laying in areas of the map that are made for seeing not blinding and will have 1 minute of use also the killer will see perfectly fine but will get a notification when entirering the dark area of the map. A dark area should cover half of the map? That would be like 3-4 generators which would make generators harder to do because is not safe doing those generators when survivors doesn't have full fov. Also I think brightness should be increase for some maps like Badham and Macmillan estate because those are really damn dark.
Comments
Also fov decrease for survivors will be so you can't see very well around corners so looping will be risky. And the dark area for survivors look like the screen is dark but dim very lightly lit.
The thing about changing light levels is it's really hard to balance, which is why they removed the offerings that made the moonlight brighter or darker in the first place. On top of that, it's pretty easily circumvented by just adjusting the brightness on your monitor (which, incidentally, is what you should do if you think certain maps are too dark - unless it's a problem that everyone complains about, which it isn't, chances are it's your fault, not the game's).