Red light vs near infrared light
Red light and near infrared light sit next to each other on the electromagnetic spectrum. Red light is visible to the human eye. Near infrared is outside the visible range.
Why devices combine them
Researchers study wavelengths in both regions. Consumer panels often combine red and near infrared LEDs so one device can deliver both spectral regions.
What a wavelength tells you
Wavelength identifies a property of the light. It does not describe the full exposure. Irradiance, time, distance, treatment area, and protocol also matter.
What to check before buying
Look for exact wavelengths and clear controls. Some devices let you operate red and near infrared channels separately. That can be useful when you want more control over the routine.
Joovv as an example
Joovv currently lists 660 nm red light and 850 nm near infrared light for its Go, Mini, and Solo devices.