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Published online: June 02, 2021
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- Ultraviolet A1 phototherapy utilizing ultraviolet light-emitting diodes and a short wavelength cutoff filterJournal of Dermatological ScienceVol. 101Issue 2
- PreviewUltraviolet (UV) A1 phototherapy selectively uses longer UVA1 wavelengths (340−400 nm), and does not include the shorter UVA2 wavelengths (320−340 nm) or UVB wavelengths (290−320 nm) that cause erythema reactions. Several studies in which a metal-halide lamp was used as a light source demonstrated the efficacy of UVA1 phototherapy for various diseases in which T cells infiltrate the dermis and induce excessive collagen accumulation, such as in atopic dermatitis [1], T-cell lymphoma [2], and systemic sclerosis [3].
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