It has been known for the past couple decades that Narrowband Ultraviolet B (UVB) in the 311nm range has a therapeutic effect on chronic skin disorders. Psoriasis and Vitiligo, for example, are thought to be autoimmune disorders, and there is currently no cure. UVB Phototherapy treats the underlying cause of the disorder to restore a more normal, healthy appearance of the skin.
Normal skin cells take about a month to grow and rise to the surface of the skin. With psoriasis, skin cells regenerate every few days and pile up on the skins surface resulting in dry, scaly patches of skin. UVB Phototherapy delivered in the narrowband 311nm range to affected areas of the skin and scalp slows the skin cell growth. Clearer, more normal looking skin is visible within the first two week course of treatment for most patients.
Vitiligo is the result of damaged pigment cells (skin cells that produce skin color). UVB Phototherapy in the 311nm range emits a narrowband wavelength to affected areas of the skin to stimulate production of pigment cells to restore the skins natural color. Today, UVB (311nm) Phototherapy is the leading choice of treatment by doctors for vitiligo.