IR,
I think as a singular photon, light will act as a particle. Once you get it acting with a group of photons, its going to act more like a wave. I guess this goes in line with the quantum state "theory". Again, as always, the problem is; looking at the problem IS the problem.
What I find funny is that they are going to pack the photons in tight enough to create a "solid". Solid light?!?!?! Holy crap! that's something that i would not have tought of.
Oh well, good luck
-bix