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Experimental data on the energy efficiency (EE) of input/output of radiation along its entire propagation path in the medium of photopolymer holographic gratings and a planar waveguide were obtained and analyzed. It was found that the main contribution to radiation power losses is made by absorption in the photopolymer medium due to incomplete bleaching of the dye during post-processing of holograms, as well as their relatively low diffraction efficiency (DE). Due to insufficient matching of the spectral characteristics of reflection holograms and LED displays, only part of their radiation power is used as a useful signal. Taking into account the obtained experimental data, the final estimate of the EE was ~ 10 % relative to the LED radiation power at the input of the entire "input/output gratings - waveguide" structure. To increase the efficiency, it is necessary to use recording media with a small thickness (less than 10 μm) and, at the same time, with a large amplitude of photoinduced change in the refractive index, which can provide the necessary DE and the degree of matching of the specified spectral characteristics, as well as reduce absorption in the photopolymer medium. In this case, the expected EE value can be ~ 40 %.