This command automatically activates the user lights and at the same time deactivates default.
Use:
Click the icon or select the Visualization > Realistic lighting... command from the drop-down menu.
To visualize the realistic lighting in your part or assembly document, you must be with the realistic rendering, with a conical perspective and the document must have an environment.
To deactivate the realistic lighting, just click again the same icon.
icon or select the Visualization > Realistic lighting... command from the drop-down menu.