I am not so sure this LED is the end of all things. I used it, but the results were rather suboptimal. I got much, much better movement tracking with the reflectors.
I used those reflectors in two ways.
Once on a baseball cap with the reflectors positioned ontop the... (no idea what it is called in english, the part protecting your eyes from the sun)
The other way stuck to the bow of my headphones.
That method produced the best results by far which, imho, is no wonder, as in this case your reflector is directly located on your head's twist axis.
However, to get best results here you need the reflector raise a centimeter or two above that headphones bow, else it will be hidden by your own head once you move the head up.
Some headphones have an extended bow that is just perfect for that, like this one:
Without, as in the case of the G930, you have to build something yourself to get the same result. My first method was quick and dirty. I folded a sheet of paper to a size roughly the equivalent of the TrackIR clip, placed it ontop of an old eraser and put this combo ontop of my headphones simply attaching it with duct tape. Looked silly, but worked perfectly.
Now I use a self made wireframe following the same setup logic, but with the added benefit of it being freely attachable to the headphones. If you need help here I am more then willing to lend a hand, though I am sure you will figure something out yourself.