Calm down. The bloom is included in the HD Mod. I use Ambient Light. It just intensifies the closer you get to the light source. When you get a few steps back it goes back to normal. The eye adaptation feature works pretty well in Deus Ex, in Thief is a bit harder to tweak but you're at least able to see shapes in the dark which for me works well in Thief. It's a matter of taste as well, I try to use common sense from my perspective.
If I'm looking directly at a light source while close to it, should be blinding.
If i'm in a room and there's a light source in it, I should be ale to distinguish shapes in the dark areas.
If I'm outside with a full moon, it shouldn't be so dark on the ground.
I also use Color Matrix then tweak the saturation to eliminate exaggerated tints in textures.