This LoRA slider influes on the "chiaroscuro" style, increasing the darkness of the elements that are not directly lit while preserving the lit elements.

The sample images weights range from -2 (uniform lighting) to 5 (darker shadows).

If the overall lighting of the scene is "soft" or "diffuse", then the slider will darken the entire scene. To have the effect pop-up you must have a precise element that's lit more than the background. Like a lighter or a street lamp that lits a precise part of the scene.

Hope you like it!