Systems With Mulitple Stars?

I have a bit of a problem with this system I’m working on, Can anyone help?
The LWS file adds lights to your star, so it can be seen from a long way away, like real stars, right?
This is pretty simple to do if your star is at 0,0,0 (system center) but how do I add another light to another star in the system, I have no idea how to place it correctly, or where to start. 🙂

Cheers,
Greb