That's them on the map with the mouse at the entrance to that area:
It looks like this:
You'll have to climb as high as you can on the fence, and jumpstrafe to the left.
btw, some Switch users complain they can't do that lmao

As of April 2024, there's a buggy one in the West Residence — it has the wrong pinpoint on the map. Devs confirmed the bug, so they'll probably fix it soon.
Here's where game pinpoints the lightbulb and where to actually find it (Mouse icon, not the circle):