Light Slider, sort of.

This is a Light Slider that prioritize the darkest parts of the scene while the focus areas stay lit to some degree.
If you want a more neutral effect you should use my Brightness Slider instead. There is a sample showing the difference beteween these slider in the Brightness Slider samples.
Light LoRAs will almost always degrade quality, at least a little. So its best to use prompting as the main light controller, and use loras to push a little extra. Or use dedicated brightness and contrast nodes instead of a LoRA. The sample images was made with a 2-step workflow where the LoRAs only was used on the first pass, and i would recommend the same to keep the image quality high.

Check out my prompting guide to master zoom/perspective:
Controlling "Zoom" With Words Alone

Recommended range: -5.0 to 8.0