One such observed phenomenon that can be predicted by the GTC is the presence of collective "bright" and "dark" states formed by the hybridization of each molecule with each k x mode. It should be noted that these terms refer to the presence (or lack thereof) of photonic character in the energy eigenstates of this system. By hybridizing N singly excited molecular states with 0 photons with a collective molecular ground state with a single photon, N + 1 energy eigenstates are formed. The upper and lower polaritons make up the two bright states, and the other N -1 states become dark states with no photonic character, making them energetically degenerate (when ignoring disorder).