In July 2019, the American Academy of Dermatology (AAD) and the National Psoriasis Foundation (NPF) released an updated set of guidelines regarding the use of phototherapy to manage adult patients with psoriasis. Treatment with light of various wavelengths is reviewed, with a focus on modalities utilizing UV light. These guidelines provide the most up-to-date evidence regarding dosing, indications, contraindications, and adverse effects of phototherapy alone and in combination with other treatments for psoriasis. This review aims to present the recommendations in a form that is readily translatable to clinical practice.