  The production of single photons in relativistic heavy ion collisions at CERN
SPS, BNL RHIC and CERN LHC energies is re-examined in view of the recent
studies of Aurenche et al which show that the rate of photon production from
quark gluon plasma, evaluated at the order of two loops far exceeds the rates
evaluated at one-loop level which have formed the basis of all the estimates of
photons so far. We find that the production of photons from quark matter could
easily out-shine those from the hadronic matter in certain ideal conditions.
