Saving light settings as defaults
You can create a default light type so that every time you add a light to a scene, it has the same values, such as cone angle or color, and so on.
To create the current light settings as a default:
Select the light in the Scene browser of the Viewer window.
Set up the light so that it has the settings you want all future lights to use as a default.
Click Save as Default in the Light Settings.
This retains your current custom light values as a new default setting so that any new light have these values as a preset.
Image Preview area A. Default light settings
See Restoring the custom default light settings for information on how to undo changes made to these lights.