Infrared lighting
Lighting that emits infrared radiation. Light sources can be thermal radiators or infrared LEDs.
Applications can be found in security technology and image processing. LED lighting in near infrared is used in image processing when 1. a high degree of independence from extraneous light is to be achieved, 2. object details are better visible in the NIR or 3. the light should not be visible in flash mode in order to protect nearby personnel, as this area of the spectrum is not visible to the human eye.
Daylight blocking filters or bandpass filters are used to suppress the visible part of the spectrum.
Spectral range of NIR illumination for image processing (source: Vision Doctor).
