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April 1976

Photochemotherapy Using Ordinary Black Light

Author Affiliations

Pasadena, Calif

Arch Dermatol. 1976;112(4):564. doi:10.1001/archderm.1976.01630280082048

To the Editor.—  I have a patient who has been cleared of essentially 95% of his psoriasis using the method of Parrish et al1 with the substitution of ordinary black light bulbs. A single bank of seven bulbs, 91.6 cm length, was the light source at a 25.4-cm distance. This distance registered 35μw/sq cm on the ultraviolet meter. The dose was 50 mg of methoxsalen two hours before light treatments. Approximately 14 treatments were needed before a noticeable improvement was detected, and six more were needed for clearing of the chronic lesions. Most of the early treatments were at short time intervals since the light exposure was slowly increased at his biweekly visits. A final time of 40 minutes at four different exposures (front, back, and two sides) was decided. As the marked clearing developed, the patient voluntarily decreased the frequency of his office visits, and at the longer

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