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The bactericidal effect under the same light power density (5.273 mW/cm2) and different irradiation time ((a) Staphylococcus epidermis, (b) Staphylococcus aureus). The irradiation time of UV light from left to right was 30 min, 20 min, 15 min, 10 min, 7 min, 5 min, and 2 min. 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.)
