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red light can enhance the cells activity, promote cells metabolism. make skin excrete large number of collagen protein and fibretissue to fill on their own, accelerate blood circulation, increase skin elasticiry. purest blue light have effect of restrain inflammation. also has a calming effect and helps us sleep better. green light is absorbed into the skin where it has a calming effect. it helps to lighten hyper-pigmentation spots. revealing a brighter complexion. the calming effect also has anti-inflammatory properties that soothe the surface of the skin..syi