  The photon emissivity from the bremsstrahlung process ee-> ee\gamma occuring
in the electrosphere at the bare surface of a strange quark star is calculated.
For surface temperatures T<10^9K, the photon flux exceeds that of e+e- pairs
that are produced via the Schwinger mechanism in the presence of a strong
electric field that binds electrons to the surface of the quark star. The
average energy of photons emitted from the bremsstrahlung process can be 0.5
MeV or more, which is larger than that in e+e- pair annihilation. The
observation of this distinctive photon spectrum would constitute an
unmistakable signature of a strange quark star and shed light on color
superconductivity at stellar densities.
