To the Editor.—
In an attempt to maximize the rate of improvement of our patients with psoriasis, we decided to use the maximally aggressive UV protocol of Levine et al.1 This schedule required many of our patients to remain in our UV light in the B range booth for a long period, which was inconvenient for them and for the proper functioning of our clinic. To shorten the treatment time, we modified our UV booth by doubling the number of bulbs. Because of the space occupied by the door and exhaust fan, bulbs could only be added to two of the booth's four walls. We assumed the reflective inner surface would, in large measure, correct for imbalances in UV intensity. When several patients suffered focal burning, we realized there was an asymmetric energy delivery. We discovered our booth's inner surface consisted of
Androphy EJ, Eaglstein WH. UV-B-Energy Distribution in Phototherapy Equipment. Arch Dermatol. 1984;120(1):17–18. doi:10.1001/archderm.1984.01650370023002
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