Abstract
Large-area, multi-pixel photon counters will be used for the electromagnetic Barrel Calorimeter of the GlueX experiment at Jefferson Lab. These photo sensors are based on a $3 \times 3~\hbox{mm}^2$ cell populated by $50~\mu\hbox{m}$ pixels, with 16 such cells tiled in a $4 \times 4$ arrangement in the array. The 16 cells are summed electronically and the signals are amplified. The photon detection efficiency of a group of first-article units at room temperature under conditions similar to those of the experiment was extracted to be ${(28 \pm 2(stat) \pm 2(syst))\% }$ , by employing an analysis methodology based on Poisson statistics carried out on the summed energy signals from the units.
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