Narrowband UVB lightbulbs release a smaller range of ultraviolet light. The treatment seems to work more quickly and keep psoriasis flares away for longer. And it often requires fewer treatments ...

Ultraviolet A (UVA) light is less effective for psoriasis on its own but becomes more potent when combined with psoralens, ...

In UVB phototherapy, the skin is exposed to ultraviolet light in the UVB wavelengths ... or decreases in dose as tolerated until their psoriasis is cleared. Treatment frequencies and dosing ...