-Absorption rate of Porphyrin is high at 420nm which is suitable to treat acne
-After absorbs photo-sensitizer such as ALA, uses short time irradiation to activate photo -sensitizer
-Short treatement with maximized efficacy by couple of tens of pulses within 1 minute
-420(s)nm for 1 treatment improves acne and redness of acne
*429nm Cut-off filter reacts with Porphyrin which made by bacteria enducing acne, then it forms Singlet oxygen and kills the bacteria
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