The Science
How light therapy works.
No mysticism, no miracle claims. Just the mechanism behind photobiomodulation, explained in plain language, and an honest account of what the research does and does not say.
Four wavelengths, every diode.
Light is energy at a wavelength. Visible light runs from about 400 to 700nm, and infrared from 700 to 1100nm. Each TrueLight LED combines four: Yellow at 580nm to prep and recover skin, Red at 630nm and Deep Red at 660nm for rejuvenation near the surface, and Near-Infrared at 850nm, which is invisible and reaches deeper toward muscle, joint, and connective tissue. One session covers the full range from a single bulb. For a deeper walk through what each band does, see the wavelengths chapter of our red light therapy guide.
What happens in the cell.
Researchers point to two mechanisms. First, light in this range is absorbed in the mitochondria, the part of the cell that makes energy, where it is thought to stimulate ATP production and support the cell's normal energy supply. Second, hormesis: a mild, beneficial stress that prompts the body's own repair and adaptation responses. Both are studied actively. They are mechanisms, not guarantees of any outcome. We unpack the full chain, step by step, in how red light therapy works.
Depth, dose, and two modes.
Red and near-infrared light can reach roughly 8 to 10mm into the body, deep enough to touch muscle and connective tissue. The variables that matter most are wavelength, intensity at your distance, and time, and more is not automatically better. Each device offers two modes: a steady beam, often used to ease pain and soreness, and a pulsing beam intended to support cellular healing. A repeatable session at the right distance is the pattern most studies are built around, and the one a real routine can sustain. If you want the numbers behind the dose, our guide covers red light therapy dosage in plain language.
What the research says.
Using light to support the body is not new. The ancient Greeks practiced heliotherapy, healing with sunlight. In 1903, the Danish physician Niels Finsen won the Nobel Prize in Medicine for his work treating skin conditions with concentrated light, which earned him the title father of modern phototherapy. In the decades since, NASA studied light for plant growth and then for human tissue and wound healing, and that work helped move the field from anecdote toward measurement.
Today, red and near-infrared light therapy has been studied across skin, recovery, and circulation, and the body of literature is growing. The quality of that research varies: some findings are promising, others are early or mixed, and study designs differ widely in wavelength, dose, and duration.
We think the honest position is the useful one. We will point you to the mechanism and the literature, and we will not invent results. The strongest thing we can say about your experience is that consistency gives any approach its best chance, which is exactly why we engineer for a routine you can keep. For the benefit-by-benefit evidence review, read what the research actually says in our red light therapy guide.
Selected references.
- Hamblin MR. "Mechanisms and applications of the anti-inflammatory effects of photobiomodulation." AIMS Biophysics, 2017.
- de Freitas LF, Hamblin MR. "Proposed Mechanisms of Photobiomodulation or Low-Level Light Therapy." IEEE Journal of Selected Topics in Quantum Electronics, 2016.
- Avci P, et al. "Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring." Seminars in Cutaneous Medicine and Surgery, 2013.
- Wunsch A, Matuschka K. "A controlled trial to determine the efficacy of red and near-infrared light treatment." Photomedicine and Laser Surgery, 2014.
TrueLight panels are general wellness devices. These products are not intended to diagnose, treat, cure, or prevent any disease. Statements on this page have not been evaluated by the FDA. If you are pregnant, taking photosensitizing medication, or managing a medical condition, talk to your doctor before starting.