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Efficacy of blue light vs. red light in the treatment of psoriasis: a double-blind, randomized comparative study
Researchers treated psoriasis patients without treating it with any photosensitizers. Protoporphyrin IX (PpIX) is an endogenous photoreceptor. Both 420 nm blue and 630 nm red equally reduced psoriasis symptoms. Blue reduced redness more than red.
- Blue 415-490 nm
- Orange 590-630 nm
- Red 630-700 nm