Red Light: 620nm (Red Weavelength)Skin penetration depth: 1-6mm The most penetrating power, treating allergic dermatitis or ringworm to ease the pain and promote the active of the ample active ingredients activating cells, enhancing energy efficiency, promoting collagen proliferation, improving wrinkles, effective treatment of aging, skin relaxation and products deep absorption. Yellow Light: 590nm (Yellow Weavelength) Skin penetration depth: 1-2mm Effect: Improving cell's oxygen alternation function, promoting mirco circulation, decomposing pigment, promoting lymph posion discharge, curing skin roughness, red spots and deficient circulations, anti redness, red face, pigment precipitation. Reference: Used to stain therapy, can also be used for the initial treatment of herpes zoster advantage. Blue Light: 465nm (Blue Weavelength) Skin penetration depth: 1mm Effect: Bacteria killing, skin cleaning,cell activation,injury recovery, promoting protein-ossein composition, acne skin sterilization, inhibition of sebaceous gland, prevention of wound infection. Reference: often be applied in acne treatment.