The entire Temple of Time is covered in what I believe are Light Medalion symbols. I'm not sure if they are the Light Medalion, but they are most likely.
That was indeed the only kind of medallion symbol that I saw, but I assumed that the others were shown too.
I suppose the reason behind all of the other medallion's "neglectance" could be because that you get the Light Medallion when you get the Master Sword from the Temple of Time in OoT. The other reason could be that light and time are related. As you move through space, the time around you (from your perspective) slows down. If you were to go the speed of light, the time around you would be so slow that it would be as if the universe around you were standing still.
Yeah, there's probably nonsense in there, but that's how I figure it.
Also, TOT seemed more fitting for Light than the other (especially shadows, water, fire, and forest. Spirit is reasonable)