Wood's light is near ultraviolet, around 360nm.
Useful or used for:
- Detecting some skin fungal infections
- Finding poorly visible skin lesions of neurofibromatosis/tuberosclerosis in children with seizures
It is often considered that a Wood's light is useful to demonstrate the presence of semen. Recent research suggests that this may not be correct, though semen clearly fluoresces under light of other wavelengths.