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The bactericidal effect under the same irradiation time (20 min) and different light power ((a) Staphylococcus epidermis, (b) Staphylococcus aureus). The power density of UV light from left to right was 10.052 mW/cm2, 7.299 mW/cm2, 5.273 mW/cm2, 2.447 mW/cm2, 1.065 mW/cm2, and 0.58 mW/cm2. White paper used to mark the location of the test site. (Gr 1: UV-riboflavin group; Gr 2: control treated with UV alone group; Gr 3: control treated with riboflavin alone group.)
