Under medical supervision, phototherapy, also known as light therapy, involves exposing the skin to ultraviolet light. The most common types of phototherapy are narrow-band UVB (NBUVB), UVA/NBUVB (in combination), and PUVA (psoralen + UVA). The type of phototherapy used is determined by the type of skin condition. However, narrow-band UVB is the most commonly used treatment for psoriasis, eczema, and mycosis fungoides patients around the world due to its versatility and effectiveness. Furthermore, by emitting wavelengths of 311-312 nm, narrow-band UVB removes redundant and harmful UV rays. LED phototherapy equipment, fiber-optic phototherapy equipment, and conventional phototherapy equipment are all types of phototherapy equipment.