The first ALICE measurement of prompt photon production in centrality-selected Pb--Pb collisions is presented -- extending the low- x reach of previous measurements by about a factor of two. This measurement is carried out for the first time with multiple isolation cone radii, which quantifies the contribution of fragmentation photons to the total physical cross section. These data will provide new constraints on proton and nuclear PDFs, and new input for disentangling cold nuclear matter and hot QCD medium effects. Finally, the first measurement of isolated-photon hadron correlations in Pb--Pb collisions at the LHC for trigger photon energies between 18 and 40 GeV is presented. This measurement probes modification of the recoil jet due to parton energy loss in the quark--gluon plasma produced in central Pb--Pb collisions.

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