To rename a light by opening the Renaming panel for the light either:
•Go to the menu Edit > Rename or
•Double click on the Light in the Light List or
•Right click on the light in the list and select Rename from the pop-up menu
You can then rename the light using the Renaming panel and press OK
Alternatively you can also rename the light by typing a new name in the Name field, in the Light Properties panel.