Dynamic Volumetric Lighting and Sun Shadows is a mod for The Elder Scrolls V: Skyrim Special Edition that mainly enhances shadows and volumetric lighting.
Also, it fixes one of the oldest problems in the game – the lack of shadows and volumetric lighting from the sun at certain times. The mod enhances the shadow and volumetric lighting system by dynamically adjusting the game’s fSunDirXExtreme setting for each frame.
Also, the mod removes volumetric lighting at night to reduce light at dusk and dawn. Note that you can turn this off, although the volumetric lighting at night will not sync with the moon.
Finally, according to the creator, the performance hit will be minimal. You will lose 0 to 2 frames and 5 to 7 frames in tighter areas in most cases. Also, there are no known issues at this time.
You can download the mod from here.
Below you can watch a few videos demonstrating this mod.