While you are at it.
Dont use the level blueprint.
Create a sun actor (blueprint). Add the code into it.
Make variables to select the light actor and whatever other actors are referenced (skysphere bp?) / supposed to be in the level for it to work.
Then Make a blueprint interface.
Implement the Interface with custom functions.
Call functions from anywhere (including level BP if you really want to.)
End result difference?
Move the same end product off to any level with minimal tweaking.