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spa face led pdt principle time tunnel - quantum light cells enzyme activator for high energy narrow spectrum luminescence therapy. led pdt offers a completely natural, non-ablative approach to skin rejuvenation. the light from the leds interacts with the cells and stimulates them to produce collagen and elastin bioptherapy. research confirms that the same led energy can be used to inhibit collagen formation by manipulating the wavelength, cells can be turned on and off. red light is used for pdynamic therapy, and green light effectively reduces melanocytes and reduces pigment formation..syi