Phototherapy is a technology based on narrow frequency LED. It is widely used clinically to treat with various skin diseases such as acne, sun damage, vitiligo, and wound healing after surgical operations. Most recognized phototherapies include red photon, blue photon, yellow photon, green photon, near/far infrared ray and so on. 

Photon with different wave length can have various effects on skin:
Red photon: wave length 625±3nm, stimulating generation of collagen and cell activity. It is effective for all skin types and conditions, and can reduce wrinkles, lines, regain skin vitality and radiant skin tone. Its heating effects on cells can speed up blood circulation and cell movements and thus helps in getting rid of unwanted fat. Its mild wave length can also be applied on sensitive areas such as around eyes and forehead.
Blue photon: wave length 465±3nm, preventing acne breakout by killing bacteria and anti-inflammation. It is extremely suitable for sensitive and/or acne prone skin. By cleansing and balancing sebum system, it helps to lift and tighten skin as well as clear up acne and blemishes.
Yellow photon: brightening and dark spots removing, skin texture softening to reduce scars and blemishes.
Green photon: soothing redness and skin irritations.