Light Setting Manager
The Light Setting Manager is an extension for Unity3D in version 3 and 4. There the possibility was created to load and save different Lightmaps for an existing scene. So a scene with different lighting moods can be used. Since Unity3D Version 5, a different lighting middleware has been used so that the old method no longer works through the Light Setting Manager.
The documentation of the extension is here: Download PDF
For feedback and questions, please contact the Unity3D forum: LightSettingManager-Forum
Unity Asset Store
Here you can buy the extension: LightSettingManager sales page
Version 1.1 Extension to objects
Version 1.2 Extension for LightMap animations