The NATIONAL BIOLOGICAL DermaLight 90 Psoriasis UVB Lamps Phototherapy is a handheld phototherapy lamp specifically designed for dermatology. It features a UV tube light source and comes with an extra bulb for added convenience. The 2X model is intended for professional use in treating psoriasis and other skin conditions through phototherapy. This product offers a reliable and effective solution for those seeking improved skin health and relief from various skin disorders.