“…The early PLE induction studies reported success rates from as low as 10% to 30% [6][7][8] to as high as 60% to 95%. [9][10][11] These studies were based on one or more exposures of a single test site to between 1 and 10 times the minimal erythemal dose (MED) of nominal UV-B radiation (ie, 290-320 nm), although these sources almost certainly contained other UVR wavelengths. Initially, induction was achieved with UV-B, [6][7][8][9][10][11][12][13] but several authors also succeeded in reproducing PLE lesions with UV-A irradiation (320-400 nm).…”