  We compute the spectrum of photons emitted by the finite-temperature large-N
SU(N) ${\cal {N}}=4$ supersymmetric Yang-Mills plasma coupled to
electromagnetism, at strong yet finite 't Hooft coupling. We work in the
holographic dual description, extended by the inclusion of the full set of
${\cal{O}}(\alpha'^3)$ type IIB string theory operators that correct the
minimal supergravity action. We find that, as the t' Hooft coupling decreases,
the peak of the spectrum increases, and the momentum of maximal emission shifts
towards the infra-red, as expected from weak-coupling computations. The total
number of emitted photons also increases as the 't Hooft coupling weakens.
