National Biological. Provider of home UV phototherapy equipment and UV phototherapy systems for home, doctors' offices & clinics. UV home phototherapy units providenarrow-band UVB, UVA or UVB lights. UV light is safe and effective and safe for treating psoriasis, vitiligo, and otherskin conditions. Advantages of National Biological's Phototherapy Equipment:• We are a world leader in home UVB phototherapy units• Doctors prefer our phototherapy products• Full even treatment, no "cold" zones• Patented physician-guided light therapy and treatment timer• Wide range of UV phototherapy home units to cover any need. including UV phototherapy booths, panels and handheld spot phototherapy UV light therapy.