... ( PDT / LED Therapy ) Praised as “magic light”, photo dynamic is a biological active cold light, and not produces high heat. It ... make skin protection and treatment. Photodynamic nurse therapy is a new technology, using the photon power to do skin maintenance and treatment ... , heal slender wrinkles, tighten pore, and proliferate collagen protein. Has a wave length as 415mm, the blue ray has the effects ...