The core concept
Red-light and near-infrared devices use specific bands of non-ionizing light. In photobiomodulation research, wavelength, dose, tissue target and protocol all matter. consumer marketing often compresses those variables into a few headline specifications.
What to compare
When reading a product specification sheet, note the wavelength distribution, irradiance measurement conditions, treatment distance guidance, exposure-time guidance, panel dimensions and control options. None should be interpreted in isolation.
Keep evidence tied to the use
Evidence for one wavelength, protocol or clinical context should not automatically be generalized to every home device or health claim. Our health-related pages use conservative language for that reason.