... of the Phototherapy skin care and rejuvenation device(The Reason for Choosing This PDT Machine ): Light sourcePDT lightOutput waveRed 630nm ... lights can be easily switched, Control of the up-down pole for easy operation 6. Bigger area irradiation, arc design of ... 630nmBlue light: 465-470nmYello light: 580-590nmRED light: Suitable for any skin, promote blood circulation,make collagen rebirth, skin smooth ...