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Solar simulators copy the AM1.5 spectrum for an accurate efficiency measurement of solar cells.Encapsulation of solar cells with EVA and glass modify the AM1.5 spectrum inside the module.Less UV light enters the solar cell and the intensity across the entire spectral range reduces after encapsulation.This is one central contribution to the observed cell-to-module losses.Optical interactions between AR coatings on the cell and on the glass add complexity.