Figure 1: Ultraviolet-A rays emitted from the light-emitting diodes pass through the Gafchromic EBT3 film and reach the ultraviolet meter. (a) Arrangement of the ultraviolet light-emitting diodes and ultraviolet measurement device (lateral view). The Gafchromic EBT3 film is placed between acrylic boxes A and B; (b) photograph of the measurement device and ultraviolet meter. The Gafchromic EBT3 film is taped to acrylic box B