... Good effection. PDT LED Skin Rejuvenation Beauty Equipment :Light wave : 200-900 nm,red,yellow,green,blue,purple,laser,1-30hz ... every color light: 1.Red light for skin rejuvenation2.Blue light for acne3.Purple light is the combination of red light and blue light, so ... proper sequence, it can accelerate metabolism effectively. 7. Laser light:Penetrate deep layer of skin, accelerate active tissue's ...