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We studied the conversion efficiency of Vacuum Ultra Violet light of PTP films as a function of their thickness. The PTP films were coated on dichroic filters or glasses at the Leptons Laboratory, Universidade Estadual de Campinas, using the vacuum evaporation technique. The arrangement of the filters within the evaporation chamber was done to ensure different levels of pTp deposition, with those closer to the center having higher density levels. Surface density measurements were conducted by pre- and post-deposition weighing of the filters. Relative measurement of the conversion efficiency of VUV light by the PTP films were done in a vacuum monochromator with a deuterium lamp, which produces monochromatic light with wavelengths ranging from