Redefine_Cosmetology -LED means Light Emitting Diode. It's works by emitting infrared light in different skincare benefits.lt penetrates at different depths and triggers natural intra cellular reaction in skin cells. Depending on light your skin is going to respond differently. Red light -lt increase blood flow to the skin .So it promotes blood circulation, it also encourage healing & rejuvenation Blue light - Stimulation production of oxygen redicals that kill P acne bacteria without damaging skin. Amber - stimulation collagen & elastin so used as anti-ageing. White light - penetrates the deepest and works to tighten & reduce inflammation. It can be done as standalone treatment or used after chemical peels , microdermabrasion microneedling , radio frequency etc.