Locking a Light or Rig's Transform
Once a light is in the correct position, you can lock it to prevent accidental movement. Locking a light does not prevent it from being edited or deleted.
To toggle whether a light is locked, right-click on the light and select Toggle Lock State of Selected Items or press Ctrl+L. The blue lock icon is either added or removed in place of the light icon in the Gaffer object table.
Note: Locking a rig works the same way. Simply right-click on the rig and select Toggle Lock State of Selected Items or press Ctrl+L.