Currently I'm using this reshade with Essenthy's STLM 3 but it will fit to any other lighting mod because changes are very subtle.
Instruction:
1 Run ReShade_setup_3.05.exe
2 Click "Select game"
3 Select the witcher3.exe from The Witcher 3 Wild Hunt\bin\x64 folder
4 Choose Direct3D10+ and click Yes to download Shaders. After download check all effects and click OK.
5 Go to your bin/x64/reshade-shaders folder and delete all Shaders inside "Shaders" folder
6 Copy DreLL47's Reshade.ini, dxgi.dll and reshade-shaders from my reshade pack to bin/x64 folder and overwrite everything
In-Game:
1 Press Shift+F2
2 Continue/ choose DreLL47's Reshade/continue/contiune/finish
3 Go to Settings and configure Effects toggle key [for me it's F12]
4 Close the window
You are good to go