Face lifting, Rejuvenation, Pigmentation, Vascular, Acne , Hair removal E light (IPL+RF) Working Principle:1. Release IPL and RF at ... collagen while overcome side effect of IPL treatment(IPL and laser):not enough energy penetrating depth and possible pigmentation by melanin ... collagen growth to repair aged and damaged collagen layer.3. E-light is absorbed by acne target and release oxygen ions to ...