1.KN-4003LA wavelength: 365+ / -5 NM, KN-4003LB wavelength: 315+ / -5NM. single root import high efficiency lamp. 2. radiation of inner reflector, high irradiation intensity. 3. lightweight portable, wide applicability.4.For treatment of psoriasis, Vitiligo, eczema and dermatitis, Pityriasis Dermatosis.