IEC 60601-2-57:2011 applies to basic safety and essential performance of equipment incorporating one or more sources of optical radiation in the wavelength range 200 nm to 3 000 nm, with the exception of laser radiation, and intended to create non-visual photo-biological effects in humans or animals for therapeutic, diagnostic, monitoring, cosmetic/aesthetic or veterinary applications; hereafter referred to as light source equipment. IEC 60601-2-57:2011 does not apply to equipment for sun tanning, for ophthalmic instruments or for infant phototherapy. Light source equipment may consist of a single or multiple sources of optical radiation, with or without power supply, or may be incorporated into a complex system that includes optical, electricalor mechanical systems or sources of other radiation.