  We present a consistent, generally covariant quantization of light for
non-vacuum birefringent, Lorentz-symmetry breaking electrodynamics in the
context of the Standard Model Extension. We find that the number of light
quanta in the field is not frame independent, and that the interaction of the
quantized field with matter is necessarily birefringent. We also show that the
conventional Lorenz gauge condition used to restrict the photon-mode basis to
solutions of the Maxwell equations must be weakened to consistently describe
Lorentz symmetry violation.
