... life. 2.Small bulk, lightweight, operation simply UV RADIATION TREATMENT SYSTEMTreated by ultraviolet radiation from 20s of 21 century. With ... by patients because it has much shortcoming such as long treatment period, great side effective, easy relapse and so on. ... pain, we researched and developed YK-6000 series UV radiation treatment system which is very effective for leukoderma, psoriasis, pityriasis ...