Photodynamic 1.48 nano-scale genetic biological wave LED cold light sources 2.Red, yellow, blue, red yellow, red blue etc. ... cold light sources With red, yellow, blue, red yellow, red blue wavelength etc optional 1 min, 2mins, 3mins, 4mins,5mins or continuous ... /week after improvement.Treat acne, while repair damaged skin LED light device KN-7000C