Infrared light therapy, explained

Infrared light therapy, also called photobiomodulation, uses specific wavelengths of red and near-infrared light to influence how cells produce energy. The mechanism that gets the most research attention is the interaction between near-infrared light and cytochrome c oxidase in the mitochondria, which appears to increase ATP production and modulate inflammation.

Red vs near-infrared vs far-infrared

The three bands behave very differently. Red light (roughly 630 to 700 nm) is absorbed mostly at the surface and is studied for skin, scalp, and superficial wound healing. Near-infrared (roughly 800 to 880 nm) penetrates deeper into muscle, joints, and bone, which is why it is the band used in most pain and recovery studies. Far-infrared sits much further along the spectrum, is felt as radiant heat, and is the band saunas use. They are not interchangeable.

What the research does and does not show

The strongest peer-reviewed evidence sits in three areas: short-term reduction in musculoskeletal pain, recovery from intense exercise, and certain skin conditions. The evidence is thinner, though active, on things like cognitive performance, mood, and metabolic markers. Read claims carefully and separate “studied” from “proven.”

What to look for in a panel

• Verified irradiance, ideally measured with a calibrated solar power meter at a stated distance.
• Real specs for wavelength, not just “red and infrared.” Look for the actual nanometer ranges.
• Flicker. Cheap panels often run high-flicker LEDs that can be uncomfortable for sensitive users.
• EMF readings at close range. Some panels produce strong fields from their drivers.
• Servicing. A panel you can repair beats a panel you have to replace.

Where to go deeper

For practical sessions, see our piece on red light therapy for chronic pain. For the at-home versus clinic decision, see photobiomodulation at home vs in the clinic. The founder of SunPowerLED, Tom Kerber, hosts a free weekly webinar that walks through these questions in plain language.