Low EMF Infrared Sauna for Skin: What Red Light Therapy Really Does for Your Glow

The strongest photobiomodulation evidence clusters in two broad windows: roughly 600–700 nm in visible red light and 780–950 nm in near-infrared. Mitochondrial chromophores, most famously cytochrome c oxidase, or Complex IV of the electron transport chain, respond within these regions, which is why wavelength matters if the goal is mitochondrial signaling and ATP production rather than simply making a room glow red.

The science points to a useful practical idea: if red and near-infrared light can influence mitochondrial function, then the quality of our everyday light exposure matters. That becomes especially relevant as days shorten and more of our waking hours move indoors, where screens and overhead LEDs often replace the much broader spectrum of natural daylight.

Andrew Huberman’s recent appearance on The Diary of a CEO [1] helped bring that conversation into the mainstream, with a segment devoted to sunlight, long-wavelength light, mitochondria, and glucose metabolism. The episode passed 6.7 million YouTube views in less than two weeks, giving a much larger audience a reason to start asking questions that photobiomodulation researchers have been investigating for decades.

We often hear red light discussed in terms of nanometers and ATP, but that conversation tends to stop right before the question that actually matters: which wavelengths matter, and what is the best way to get exposure to them?

Table of Contents

1. What Wavelength Range Actually Triggers Mitochondrial ATP Production?
2. How Deep Does Red and Near-Infrared Light Actually Penetrate Body Tissue?
3. Does Red and Near-Infrared Light Exposure Actually Affect Blood Sugar?
4. Why Does Full-Spectrum Incandescent Light Differ From Single-Wavelength LED Devices for Mitochondrial Support?
5. What Does Cellular Melatonin Have to Do With Antioxidant Protection From Light Exposure?
6. How Should You Get Near-Infrared Light Exposure When Natural Sunlight Drops in Winter?
7. Frequently Asked Questions
8. Is Near-Infrared Light Worth Adding to Your Routine, or Is This Just a Trend Spike?
9. References

What Wavelength Range Actually Triggers Mitochondrial ATP Production?

If you’re researching near-infrared light mitochondrial health, the useful answer is not one magic wavelength. Research repeatedly finds biological activity across roughly 600–700 nm red light and 780–950 nm near-infrared, with mitochondrial chromophores including cytochrome c oxidase responding at several points within those ranges and potentially influencing electron transport and ATP synthesis.

Cytochrome c oxidase sits at the end of the mitochondrial electron transport chain, where it helps transfer electrons to oxygen and maintain the proton gradient that ultimately powers ATP synthase. Early action-spectrum work found particularly strong cellular responses around 620, 680, 760, and 820 nm, which helps explain why wavelengths such as 660–670 nm and 810–850 nm appear so often in photobiomodulation research.

The mechanism is more complicated than the popular shorthand that photons simply “charge your mitochondria.” Red and near-infrared light appear capable of influencing mitochondrial membrane potential, nitric-oxide signaling, reactive oxygen species, water dynamics, gene expression, and other pathways alongside cytochrome c oxidase. A 2020 Frontiers in Aging Neuroscience review [2] makes exactly that point: cytochrome c oxidase is important, but mitochondrial photobiology is not a one-receptor story.

In other words, your mitochondria do not have an 850 nm charging port.

The Mitochondrial Light Windows

A review of photobiomodulation parameters similarly describes 600–700 nm as better suited to superficial tissue and 780–950 nm as preferable when deeper tissue is the target. Exact penetration figures vary enormously because skin, blood, fat, muscle, bone, irradiance, and treatment geometry all change what ultimately reaches the target.

The Glow Infrared Therapy Light uses a single 250W FireLight® incandescent bulb that emits visible red, the full 700–1500 nm near-infrared range, and longer mid- and far-infrared wavelengths. The mitochondrial photobiomodulation windows therefore sit inside Glow’s larger continuous spectrum rather than representing its entire output.

How Deep Does Red and Near-Infrared Light Actually Penetrate Body Tissue?

Near-infrared generally travels more deeply through tissue than visible red, but there is no universal penetration number. Wavelength is only part of the equation. Pigmentation, blood and water content, tissue type, source power, beam geometry, and scattering all help determine how much light reaches deeper structures.

Research on tissue transmission consistently shows the same broad pattern: visible red is concentrated more superficially, while wavelengths in the near-infrared region tend to travel farther before being absorbed or scattered. The amount that survives falls dramatically with depth, so penetration should never be confused with delivering the same intensity several centimeters below the skin.

Huberman summarized this on The Diary of a CEO by saying that long-wavelength red light can reach “roughly eight centimeters” into the body. It is a useful illustration of how surprisingly far longer wavelengths can travel, but not a universal therapeutic-depth figure that applies to every wavelength, tissue, or device.

What matters more than any single number is the pattern: different wavelengths travel to different depths and interact with tissue differently. That is one reason we never wanted to build SaunaSpace around one narrow LED peak.

“Nature never gives us one wavelength at a time. We evolved under sunlight, a continuous spectrum of light and heat arriving together, with different wavelengths reaching different depths and doing different things in the body. FireLight was our attempt to preserve that biological coherence rather than reducing something as ancient and complex as sunlight to a single LED peak.”

— Brian Richards, Founder & CEO, SaunaSpace

Does Red and Near-Infrared Light Exposure Actually Affect Blood Sugar?

There is intriguing human evidence that it can. In 2024, Michael Powner and Glen Jeffery published a small human study in the Journal of Biophotonics [3] showing that 15 minutes of 670 nm red-light exposure before an oral glucose challenge reduced the subsequent elevation in blood glucose compared with the control condition.

The study included 30 healthy participants, half of whom received 670 nm light across roughly 800 cm² of the upper back. The red-light intervention reduced the increase in glucose over the following two hours by 27.7%, while the maximum glucose spike itself was reduced by 7.5%.

The proposed explanation is mitochondrial. Photobiomodulation may increase mitochondrial membrane potential and ATP production, which in turn increases cellular demand for glucose and alters the way glucose is handled after ingestion. That mechanism, rather than the surrounding podcast attention, is what makes the study so interesting.

It is a fascinating result, not permission to point a red lamp at yourself and binge on sugar. The trial was small, involved healthy adults, and tested one specific protocol, so red light therapy and blood sugar remains an emerging research area rather than an established metabolic treatment.

Why Does Full-Spectrum Incandescent Light Differ From Single-Wavelength LED Devices for Mitochondrial Support?

A properly dosed single-wavelength LED can absolutely stimulate mitochondrial photobiomodulation if it lands within an effective wavelength range. Full-spectrum incandescent light offers a different advantage: it covers many biologically active red and near-infrared wavelengths simultaneously rather than concentrating almost all of its output around one carefully selected spectral peak.

An LED at 660 or 850 nm is making a very precise bet, which can be useful when precision is the point. FireLight takes a broader approach: a hot tungsten filament naturally creates a smooth continuum of wavelengths, including visible red, the full 700–1500 nm NIR range, and longer infrared wavelengths, along with the radiant warmth that comes from incandescent light.

Glow turns that spectrum into a compact daily tool: one 250W FireLight bulb inside a shielded fixture on a basswood base, rather than a wall of tiny electronic diodes. You can use it beside a desk, move it around the body, travel with it, or simply add long-wavelength incandescent light to an indoor environment that otherwise consists largely of screens and LEDs.

For someone who wants the same spectrum scaled into a full-body heat session, the FireLight Full-Spectrum Red & Infrared Sauna adds substantial thermal stress and sweating. Glow is the more targeted, everyday light tool; FireLight Sauna is the whole-body light-plus-heat experience.

The appeal of that broader light environment also helps explain why people come to SaunaSpace for more than one narrowly defined outcome. In our most recent post-purchase survey of 473 customers, healing and recovery was the most commonly selected of these motivations at 52.9%, followed by better sleep at 46.7%, stress reduction at 43.3%, and immune support at 42.7%. Enhanced cognition at 28.5% and longevity at 28.3% were also part of the picture.

These are purchase motivations, not proof of outcomes, but the pattern is revealing. People are not approaching light solely as a cosmetic surface intervention or a single-purpose optimization tool. They are drawn to it as part of a broader, whole-body practice.

What Does Cellular Melatonin Have to Do With Antioxidant Protection From Light Exposure?

Melatonin is not only the darkness hormone that helps regulate sleep. Cells and mitochondria also appear capable of producing melatonin locally, where it acts as part of the antioxidant system that helps control oxidative stress generated during normal energy production; emerging research suggests near-infrared light may stimulate this local melatonin pathway.

That distinction is fascinating because mitochondrial energy production is inherently messy. Moving electrons efficiently through the respiratory chain inevitably creates some reactive oxygen species, so mitochondria need their own antioxidant defenses close to the place where that chemistry is happening.

A 2023 review by Tan, Reiter, Zimmerman, and Hardeland [4] proposed that near-infrared exposure may increase extrapineal and mitochondrial melatonin production, potentially helping cells manage that oxidative load. The authors describe this as a plausible mechanism behind some effects of sunlight and photobiomodulation, although the precise pathways and their importance in humans are still being worked out.

Huberman has highlighted this distinction as well: the melatonin story here is not “red light makes you sleepy.” It is cellular melatonin functioning locally as an antioxidant, which is a very different job from the nighttime pineal signal that tells your brain it is time for bed.

How Should You Get Near-Infrared Light Exposure When Natural Sunlight Drops in Winter?

Start with actual daylight whenever life permits, then use incandescent red and near-infrared light to fill the gaps modern life creates. Winter sunlight still contains red and NIR wavelengths; the practical issue is that shorter days, cold weather, clothing, offices, school schedules, and screens can dramatically reduce the amount of full-spectrum outdoor light we actually receive.

That gives us a useful hierarchy rather than an either-or choice. Natural daylight remains the starting point whenever it is available, while incandescent light can supplement the spectrum when winter and indoor life make consistent sun exposure harder. Huberman has made a similar point in discussing light exposure: start by getting outside rather than treating artificial devices as replacements for the sun.

Of course, winter has a way of making even the best intentions theoretical. This is where the Glow Infrared Therapy Light becomes practical. SaunaSpace recommends 5–10 minutes at 12–40 inches for the face or throat, with roughly 15–18 inches as an ideal working distance; other body areas can be exposed longer, and Glow can remain on for extended ambient use when it is not continuously aimed at one spot.

Morning or daytime is an easy place to put it. Get natural outdoor light first when you can, then use Glow beside your desk, while stretching, reading, meditating, or anywhere else that normally leaves you sitting under cold artificial light.

There is also an appealing logic to bringing incandescent light into a screen-heavy room. Glow does not somehow erase blue photons from your laptop. Sadly, physics has declined to provide an “undo” button. But it does restore broad red and near-infrared wavelengths to an indoor environment dominated by short-wavelength LEDs. Jeffery and Huberman have specifically discussed [5] the importance of balanced, full-spectrum light rather than thinking about individual wavelengths in isolation.

For the larger context, see SaunaSpace 101: Light, Heat, and the Future of Healing and our guide to near-infrared sauna benefits. To bring that spectrum into your own space, explore Glow for focused daily light exposure or use our sauna builder to create a full-body FireLight experience at home.

Frequently Asked Questions

Is red light (roughly 600–700nm) or near-infrared light (roughly 780–950nm) more effective for mitochondrial stimulation?
Neither range is universally more effective. Red wavelengths such as 660–670 nm are well studied for mitochondrial photobiomodulation, while near-infrared wavelengths around 810–850 nm generally penetrate more deeply, so the most useful range depends partly on the tissue you are trying to reach.

Does the exact nanometer wavelength matter, or does any red light stimulate mitochondria the same way?
The wavelength matters. Photobiomodulation has distinct action and absorption regions rather than a flat biological response across all red and infrared light, which is why certain wavelengths appear repeatedly in successful experiments.

Why do different sources cite different “ideal” wavelength ranges for mitochondrial ATP production?
Because there is no single mitochondrial wavelength. Different sources may be describing chromophore absorption peaks, broader photobiomodulation windows, wavelengths that performed well in particular experiments, tissue-penetration ranges, or simply the spectrum produced by a specific device.

Can a single-wavelength LED device stimulate mitochondria as effectively as a full-spectrum source?
A well-designed single-wavelength LED can absolutely stimulate photobiomodulation at an effective wavelength and dose. A full-spectrum incandescent source offers a different advantage by exposing the body to multiple red and near-infrared regions simultaneously rather than concentrating nearly all its energy around one narrow peak.

How does the wavelength range for mitochondrial and ATP benefits differ from the range typically marketed for skin-only benefits?
Skin-focused devices often emphasize visible red wavelengths around 630–670 nm because red light is concentrated more superficially. Near-infrared wavelengths around 780–950 nm generally travel farther into tissue, which is why they become more relevant when the target extends below the skin.

Is Near-Infrared Light Worth Adding to Your Routine, or Is This Just a Trend Spike?

The current attention spike may be podcast-driven, but the underlying photobiomodulation science predates it by decades. Researchers were mapping red and near-infrared action spectra, mitochondrial responses, and cytochrome-c-oxidase activity long before “mitochondrial health” became a category on anyone’s wellness dashboard.

What has changed is that the research is becoming easier to connect to ordinary life. Powner and Jeffery’s glucose work gives us a vivid human metabolic example, while broader research on mitochondrial signaling and tissue penetration makes the relevance of everyday light exposure increasingly difficult to dismiss.

The conclusion is not that everyone now needs to chase the perfect nanometer. Nature never worked that way.

Sunlight is spectacularly broad, and biology evolved inside that complexity. FireLight follows the same general logic: rather than choosing a single LED wavelength and declaring it the answer, it gives you a continuous incandescent spectrum containing multiple biologically active red and near-infrared regions at once.

That is the idea behind the Glow Infrared Therapy Light: a small, portable way to bring broad-spectrum incandescent light into the places where modern life increasingly leaves the sun behind, including your desk, your office, your hotel room, and the long dark stretch of winter.

Mitochondria may be microscopic.

Your light environment is not.

Explore the Glow Infrared Therapy Light and bring full-spectrum incandescent light into your daily routine.

References

[1] The Diary of a CEO with Andrew Huberman. September 2026. Discussion of sunlight, long-wavelength light, mitochondrial function, and the Powner/Jeffery glucose study.

[2], [4] Foo ASC, Soong TW, Yeo TT and Lim K-L (2020) Mitochondrial Dysfunction and Parkinson’s Disease—Near-Infrared Photobiomodulation as a Potential Therapeutic Strategy. Front. Aging Neurosci. 12:89. doi: 10.3389/fnagi.2020.00089.

[3] Powner MB, Jeffery G. “Light stimulation of mitochondria reduces blood glucose levels.” Journal of Biophotonics. 2024. Human 670 nm photobiomodulation study examining mitochondrial activity and oral glucose response.

[4] Tan DX, Reiter RJ, Zimmerman S, Hardeland R. Melatonin: Both a Messenger of Darkness and a Participant in the Cellular Actions of Non-Visible Solar Radiation of Near Infrared Light. Biology (Basel). 2023 Jan 6;12(1):89. doi: 10.3390/biology12010089. PMID: 36671781; PMCID: PMC9855654.

Huberman Lab with Glen Jeffery, PhD. “Using Red Light to Improve Metabolism & the Harmful Effects of LEDs.” Discussion of red/NIR light, mitochondrial biology, glucose metabolism, LEDs, and full-spectrum light.