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led skin rejuvenation is the interaction of light, delived through light emitting diodes(led),to activate cell receptors causing them to produce collagen or multiply. one of the original applications for leds was p dynamic therapy(pdt), using p-activated creams for the treatment of actinic keratosis and pre-cancerous lesions. seven types of specific light source for clinical treatment non-risk of burning with safe optical technology high power piranha leds, pure light and enough energy.syi