This is a slider LoRA. It's goal is to change the brightness of a scene.

Positive values make the scene brighter

Negative values make the scene darker

Maximum Strength: ~1

Minimum Strength: ~-1

The exact strength to use will change a lot depending of your original prompt. Some scenes are harder to affect than others. Like with all sliders, it's probably best to use it in small amount. For the examples, I used extreme values.

The LoRA strength is overlaid on the pictures. All pictures have the same seed.

If you try to make a scene too dark, it will often turn black and white or slow movements.

If you try to make a scene too bright, it will often turn to a drawing or accelerate movements.

I tried to make it so it can turn day into night but I find that it struggles with that, especially in urban settings. It's probably best to prompt for night or day scenes and make adjustments with the slider. It definitely work better for indoor scenes.

The LoRA was trained with Ostris AI-Toolkit in concept slider mode: https://github.com/ostris/ai-toolkit

Target class: scene and room lighting

Positive training prompt: bright scene, bright room, daytime scene, illuminated scene, illuminated room

Negative training prompt: dark scene, dark room, nighttime scene, lightless scene, lightless room

Anchor class: none