  A test of the benchmark QED process e+e- -> gamma gamma (gamma) is reported,
using the data collected with the DELPHI detector at LEP 2. The data analysed
were recorded at centre-of-mass energies ranging from 161 GeV to 208 GeV and
correspond to a total integrated luminosity of 656.4 pb^{-1}. The Born
cross-section for the process e+e- -> gamma gamma (gamma) was determined,
confirming the validity of QED at the highest energies ever attained in
electron-positron collisions. Lower limits on the parameters of a number of
possible deviations from QED, predicted within theoretical frameworks
expressing physics beyond the Standard Model, were derived.
