BIO LIGHT LED skin care machine; Red,Blue,Yellow and mixed colors; with SMD LEDs; Purer light and high efficiency;CE What is LED Skin Rejuvenation? LED Skin Rejuvenation is the interaction of light, delivered through Light Emitting Diodes (LEDs), to activate cell receptors causing them to produce collagen or multiply. One of the original applications for LEDs was PhotoDynamic Therapy (PDT), using ...