Learning centre / Introduction
How does the light work?
Red and near-infrared light devices use specific bands of light. What a device is intended to do depends on its design, output, usage instructions and the evidence for that specific device.
Key concepts
Wavelength and nanometres · Irradiance and measurement distance · Device types · Safety information · Evidence for individual products
Manufacturer documentation and product-specific evidence are essential when choosing a device. A general study does not establish results for a specific product.