The ALICE experiment is optimized to study the properties of hot quark–gluon plasma produced in ultrarelativistic heavy-ion collisions. One of the electromagnetic calorimeters of ALICE, the Photon Spectrometer (PHOS), is designed for measuring direct photons and neutral mesons spectra. The possibility of increasing the working area of the PHOS detector by using PbWO 4 crystals of the CMS experiment is currently under consideration. It is possible to change the kinematic range by varying pseudo-rapidity, with a constant azimuthal angle, or azimutal angle, with the same pseudorapidity. It is also possible to move apart the detector modules without adding additional crystals. The proton collisions at energy of 13 TeV have been simulated by the Monte Carlo method using the PYTHIA software package. On the basis of the simulation results, it can be stated that for measurements in the low p T region increasing the azimuthal angle is the most optimum, since it becomes possible to investigate the p T region down to 25 MeV/ c for π 0 . This makes it possible to measure direct photons in the very low energy range (tens of MeV) and possibly verify the Low theorem for soft photons. At the same time, the available range for measuring—the η meson also significantly increases (down to 50 MeV/ c ).