Certain standards for uniformity of irradiance should be adopted to insure reasonable uniformity of exposure to various parts of the patient's body. Exposure times and amount of UV-B (wavelengths between 280 and 320 nanometers) also need to be controlled to minimize risks to patients. There are numerous aspects to the proper administration of a controlled dose of longwave ultraviolet radiation (UV-A). Only by adoption of proper regulations and controls can risks to patients and attending personnel be minimized.
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