What does narrowband UVB treatment involve?

Patients attend for phototherapy two to five times weekly. If whole-body treatment is recommended, the patient is placed in a specially designed cabinet containing
fluorescent light tubes.The patient stands in the centre of the cabinet, undressed except for underwear, and wears protective goggles. Usually the whole body is exposed to the UVB for a short time (seconds to minutes).

Shorter bulbs can be used for localised UVB treatment, eg of hands and feet or a small body region.