You bought a red light panel, or you're thinking about one. Now what? How close should you sit, for how long, and how often? Researchers who study photobiomodulation have been asking the same question for decades, and their answer is more nuanced than "more is better."
Study at a glance
- Paper: "Mechanisms and applications of the anti-inflammatory effects of photobiomodulation"
- Authors: Michael R. Hamblin
- Journal / year: AIMS Biophysics, 2017
- Type: Narrative review of laboratory, animal and clinical literature
- Supporting papers: Huang, Chen, Carroll & Hamblin, Dose-Response, 2009 (biphasic dose response); Cronshaw et al., Dentistry Journal, 2020 (dose parameters, systematic review and meta-analysis)
What the research shows
Photobiomodulation (PBM) is the use of low-level red and near-infrared light to influence cell activity. In his 2017 review, Hamblin describes reduced inflammation as one of the most reproducible effects reported for PBM, and notes that the response to light follows a biphasic dose pattern: low levels of light tend to have stimulating effects, while high levels tend to have inhibitory effects. The 2009 Dose-Response paper explores this same pattern in detail and notes that choices such as wavelength, fluence, power density and timing have produced both positive and negative results across studies.
A separate 2020 systematic review and meta-analysis of PBM in dentistry (38 papers screened from 766 identified articles) found that optical parameters and total energy delivered appear to matter for outcomes, and that reported results differ considerably between studies. The authors concluded this variation merits further investigation. An earlier body of literature has also flagged that many PBM papers report their irradiation parameters incompletely, which makes comparing doses between trials hard.
What this does not tell us: these papers do not provide a single, universal home-use protocol, and much of the clinical evidence comes from clinical settings and specific conditions rather than consumer panels. Treat the findings as a framework for sensible habits, not as a prescription.
Why it may work
According to the review, light in the red and near-infrared range is thought to be absorbed mainly by cytochrome c oxidase in mitochondria, and possibly by calcium ion channels. This is proposed to influence ATP production, short bursts of reactive oxygen species, nitric oxide and calcium signalling, which in turn may shift gene activity linked to cell survival and inflammation. The authors note that the exact pathways are not fully settled.
The biphasic pattern is a practical clue: the cell appears to respond to a "sweet spot" of light, not to the maximum available.
Real-world use: turning the research into habits
Because the evidence points to moderate dosing and good reporting of parameters, a few sensible principles follow:
- Consistency over intensity. Short, regular sessions fit the "moderate dose" idea better than occasional marathon sessions.
- Follow the manufacturer's guidance. Distance from the panel changes irradiance, so the recommended distance and time for your device matter.
- Bare skin, clean skin. Light has to reach the target area, so remove clothing over it and avoid thick creams or sunscreen that could block it.
- Protect your eyes. Follow the device instructions on eye protection and avoid staring into the light.
- Keep a simple log. Note time, distance and how you feel. Since dose reporting is a known weak spot in the literature, your own notes help you judge what works for you.
Where the Gudslip panel fits
The Red & Infrared Light Therapy Panel is designed to deliver red and near-infrared light at home. It shares the mechanism described above, light in these wavelengths, but we make no claim that it treats or cures any condition, and the studies cited here were not conducted on our device. Think of it as a convenient way to build a consistent routine in line with the principles above.
How to use it
- Read the instruction leaflet for the recommended distance and session length.
- Place the panel at that distance, aimed at bare, clean skin.
- Use eye protection as directed and stay relaxed for the session.
- Start with the shorter end of the recommended time and a few sessions per week.
- Keep notes for a few weeks, then adjust within the manufacturer's limits.
FAQ
Is a longer session always better?
Not necessarily. Reviews describe a biphasic response in which very high doses may reduce or reverse the effect seen at lower doses.
Does the distance from the panel matter?
Yes. Distance changes how much light reaches the skin, which is part of the dose. Follow the device guidance.
How often should I use it?
Research does not settle one schedule for home devices. Regular, moderate use as per the manufacturer's instructions is a sensible starting point.
Can I use it over sunscreen or lotion?
It is generally advised to apply light to clean, bare skin so that nothing blocks it.
Who should check with a professional first?
Anyone who is pregnant, photosensitive, taking photosensitising medication, or living with a medical condition should ask a healthcare professional first.
The bottom line
The best-supported idea in the dose literature is simple: there is probably a sweet spot, and more light is not automatically better. Moderate, consistent, well-recorded sessions are a sensible approach, while the research as a whole still has open questions about ideal parameters.
Disclaimer: This article is for general wellness information only and is not medical advice. Gudslip products are wellness products and are not intended to diagnose, treat, cure or prevent any disease. Please consult a healthcare professional before starting any new routine.
References
- Hamblin MR. Mechanisms and applications of the anti-inflammatory effects of photobiomodulation. AIMS Biophysics. 2017;4(3):337-361. https://pmc.ncbi.nlm.nih.gov/articles/PMC5523874/
- Huang YY, Chen AC, Carroll JD, Hamblin MR. Biphasic dose response in low level light therapy. Dose-Response. 2009;7(4):358-383. https://pubmed.ncbi.nlm.nih.gov/20011653/
- Cronshaw M, Parker S, Anagnostaki E, Lynch E. Photobiomodulation dose parameters in dentistry: a systematic review and meta-analysis. Dentistry Journal. 2020;8(4):114. https://pubmed.ncbi.nlm.nih.gov/33036145/