Red light therapy: a practical beginner guide
Red light therapy is part of a broader research field often called photobiomodulation. Devices expose tissue to selected wavelengths of visible red light or near infrared light. Research results depend on the application and treatment protocol, so broad promises deserve caution.
Red light and near infrared light
Visible red light sits at the long wavelength end of the visible spectrum. Near infrared light sits beyond visible red. Home photobiomodulation devices often use wavelengths in both regions.
Why wavelength is only part of the story
A wavelength tells you which portion of the light spectrum a device emits. It does not tell you the full dose delivered to tissue. Irradiance, treatment time, distance, treatment area, and protocol all matter when interpreting a device or a study.
What does the research say?
A systematic review of home use photobiomodulation devices found mostly positive results across the included studies, while the authors also concluded that additional randomized controlled studies were needed for a conclusive evaluation of efficacy. That is a useful way to frame the field. There is real research, but the evidence should be discussed application by application.
Buying a home device
Decide what area you want to cover. Then compare wavelength, output, distance, setup, safety information, warranty, and price. A larger panel can be convenient for broader coverage, while a smaller device can be easier to position for focused use.
How to choose a panelUnderstand wavelengths