I’m not finding a preset named “Luminance” either.
However, when you say that it always goes into a new scene, try dragging the file into the Instance Tab (the panel on the right of the screen where you see your list of objects - under or on to the word “Scene”
This will bring the preset into the existing scene - rather than opening a new one.
If you want to move all lights together, try selecting all of them in the Instances Tab and hit ‘Ctrl G’, or go to Edit > Group
If you still don’t see the translation handles, try Edit > Center hotpoint
This group should make it possible to move all lights together.
Alternatively, you could select one of the lights, makes certain that “Show in 3d view” is checked. If the name of the light is greyed out - this is your culprit. I uncheck this box on lights all the time - once I have them set the way I want them.
If you still can’t find the light (to move it) select the light . Switch your view to the Directors camera (upper left of view screen) and type 0
this is the number “0” not a capital o
This will instantly zoom to the light, but will often be too close to see it. So make sure your “Move” tool is selected and zoom backwards until you can see it. Sometimes you may have to zoom back a lot more, and pan around, to figure out where your scene is from here.
One last thing; It the light you select is a “Distant” light, you can simply Edit > Send to Origin which will place the light at coordinates 0,0,0
Distant light are not affected by position, just rotation - so you can do that with them without changing their effect on the scene.
Sun Light is aimed using the sky dome illustration in the Realistic Sky editor.
Hope this either helps, or at least directs you to a more specific question