Night: the sky and fog no longer turn black when rain hides the stars, rain streaks stay faint in the dark, and a "Night brightness" option raises the moonlight and night ambient light (3x Wisdom's by default).
Rain: lighter fog in the rain ("Rain fog", 0.5 by default; 1 is Wisdom's), the water gets the same fog as the land, and the sun's glint on water fades under rain clouds.
Water: its top stays flat (the waves are in the normals, as in Wisdom), and the mirror Horizon draws with vanilla's light is brought to this pack's light.
Mobs, items, chests and particles: a post pass relights them to match this pack's light on the terrain in view, eased over time ("Light mobs and chests", with a diagnostic view).
Held light sources light the terrain when Horizon's Dynamic lights extra is on.
Glowing blocks show their own colour instead of burning out to white at night ("Glowing blocks"), with extra bloom around them ("Glow bloom").
The far edge of the loaded terrain blends into the sky ("Horizon haze").