A new mod for The Witcher 3 has been released called "Enhanced Reshade" that brings an entirely new and immersive feel to the game. "It works with all lightning mods and with Vanilla lighting. It enhances the shadows, the lighting, the colors and the contrasts" the author writes on Nexus Mods.
There are a number of steps to go through to install the mod, so head to Nexus Mods to learn how.
Good find, PCGamer!