  We study the coherence and fluorescence properties of the coherently pumped
and dissipative Jaynes-Cummings-Hubbard model describing polaritons in a
coupled-cavity array. At weak hopping we find strong signatures of photon
blockade similar to single-cavity systems. At strong hopping the state of the
photons in the array depends on its size. While the photon blockade persists in
a dimer consisting of two coupled cavities, a coherent state forms on an
extended lattice, which can be described in terms of a semi-classical model.
