What is phototherapy?

Phototherapy is the use of nonionizing electromagnetic radiation (usually in the ultraviolet [UV] range, but also extending into the visible light range) to treat cutaneous disease (Fig. 55-1).
• Broadband UVB (BBUVB): 290 to 320 nm
• Narrowband UVB (NBUVB): 311 nm
• Xenon chloride (excimer) laser: 308 nm
• UVA: 320 to 400 nm
• UVA1: 340 to 400 nm
• PUVA: Psoralen plus UVA light: 320 to 400 nm
• Blue light in Soret band: Approximately 400 to 410 nm
• Pulsed dye laser: 585 to 595 nm
• Intense pulsed light and broadband light: 300 to >2000 nm