Create, rename, or delete a light group. 
To create a light group
-  Open the Artificial Lights dialog. 
 
- Under Group Options, click New. 
 
- In the New Light Group dialog, enter a name for the light group, and click OK. 
In the Artificial Lights dialog, the new light group name displays in the list under Grouped Lights. 
  
- Add lights to the group. 
 
- (Optional) Turn the light group on or off for rendering. 
See Control the Lights. 
  
To rename a light group
-  Open the Artificial Lights dialog. 
 
- In the Artificial Lights dialog, select the group name. 
 
- Under Group Options, click Rename. 
 
- In the Rename dialog, enter a new group name. 
 
- Click OK. 
 
To delete a light group
-  Open the Artificial Lights dialog. 
 
- In the Artificial Lights dialog, select the group name. 
 
- Under Group Options, click Delete. 
 
 Revit deletes the light group. All of the lighting fixtures that belonged to that group are listed under Ungrouped Lights.