There was something to either Natural Environments, or another (similar?) mod from back in the dark ages of Oblivion modding.

Something to do with colour shift, I'm fairly sure.
What I remember is either this mod or another altering the lighting in general, from a kind of blue-ish default(?), to a warmer, yellow-ish "natural light" kind of effect.
Of course, easy enough to do with OBGEv2 (e.g., Color Moods) and/or ENBSeries, nowadays.

But, there might be something to the association of NE with warmer and/or more "natural" colours. :shrug: Or, perhaps it was another mod after all...
edit: Rather like the weather mods (such as Fellout and Dynamic Weather) that offer some relief to that green-ish hue cast upon everything in Fallout 3, by default.