Its a small code can be used at runtime/gameplay to control various settings of gameplay like music loudness change, player speed change, etc…, based on your needs. you can found code at github:
https://github.com/saravanan2020/Unity3d-Knob-Controller
Just press, hold and drag the knob up/down to change light intensity, shadow strength.
You might find this of use, a little more generic that your specific implementation, but I do like your approach.
https://bitbucket.org/UnityUIExtensions/unity-ui-extensions/src/master/Scripts/Controls/UI_Knob.cs
Part of the Unity UI Extensions library of UI controls for Unity.
https://bitbucket.org/UnityUIExtensions/unity-ui-extensions
Thank you…
