RecruitingDevice studyAn Open-Label, Pilot Study to Evaluate the Efficacy of Narrowband Ultraviolet-B Phototherapy Three Times Weekly for Twelve Weeks in Moderate-to-Severe Psoriasis PatientsA single center study of 30 patient receiving Narrowband UVB phototherapy three times weekly for 12 weeks. Patients will be evaluated through week 36 to evaluate maintenance of response.