The following are copies of peer reviewed articles on UVB light therapy for psoriasis and the use of lasers in dermatology, including psoriasis, to show that the treatment is an established therapy.
Archives of Dermatology—Comments & Opinions on the 308 nm Excimer Laser
Clinical Evaluation of Narrow-Band (311 nm) UVB & Excimer Laser (308 nm) UVB
British Journal of Dermatology—311 nm UVB phototherapy for Psoriasis
Lasers in Dermatology—A Selective Historical Review