Red Light Therapy

Backed by Science

Trusted Worldwide

What is Red Light Therapy?

Red Light Therapy (RLT), also known as photobiomodulation (PBM), is a science-backed, non-invasive treatment that uses specific wavelengths of red, blue and near-infrared light to penetrate the skin and stimulate cellular repair, reduce inflammation, and enhance overall wellness. Unlike UV light, which can be damaging, red and near-infrared light are safe and beneficial. When absorbed by the mitochondria these wavelengths boost energy production (ATP), improve circulation, and activate natural repair pathways. Over time, this can support healthier skin, faster recovery, reduced pain and inflammation, and improved vitality.

What is Red Light Therapy Commonly Used For?

Red light therapy (RLT), also known as photobiomodulation (PBM), is a non-invasive treatment that uses low-level red and near-infrared light to stimulate cellular function. It is widely used for anti-aging and skin benefits by enhancing collagen production, improving skin elasticity, and reducing wrinkles and fine lines. PBM also accelerates cellular repair, reduces inflammation, and promotes an even skin tone, helping to combat signs of aging and support overall skin health. Additionally, it can aid in wound healing, hair regrowth, and muscle recovery.

Skin Health & Anti-Aging

Red light therapy is most commonly used for its benefits on skin health and anti-aging. Many of our CELLER8 red light panel customers have shared that their skin looks healthier and that they’re even receiving compliments on their complexion. Alongside this real-world feedback, a wide range of studies support the use of red light therapy for skin rejuvenation. For example, the study below looked specifically at how red LED light could help reduce visible signs of aging and improve overall skin quality.


The clinical study tested whether red light photobiomodulation could help reverse visible signs of skin ageing. 20 adults aged 45–70 used red light therapy twice a week for 12 minutes, over a period of 3 months. The light used had a wavelength of 630 nm, which is commonly associated with skin rejuvenation effects and included in all CELLER8 red light therapy panels.


From the very first month, participants began to see measurable improvements. Wrinkles around the eyes (“crow’s feet”) were reduced, skin became firmer and denser, and the oval of the face appeared less sagged. By the end of three months, results were even more significant: wrinkle depth reduced by nearly 40%, dermal density increased by almost 48%, and overall skin firmness and elasticity improved steadily. Skin roughness and pore size decreased, complexion appeared more even, and oil (sebum) production dropped by over 70% in those with oily or combination skin.


Importantly, participants reported high satisfaction, with all volunteers noting visible improvements in skin quality. These benefits persisted for at least a month after stopping the treatment, suggesting that the results reflect genuine structural and functional changes in the skin, not just short-term cosmetic effects.


Overall, this study provides strong evidence that regular red light LED therapy may support anti-ageing skin benefits such as wrinkle reduction, improved firmness and elasticity, smoother texture, reduced pore size, and more balanced skin tone.
 

PubMed: PMC10311288

Boosts Collagen Production

Collagen is the protein that keeps skin firm, smooth, and youthful but as we age, production naturally slows. Red light therapy has been shown to stimulate fibroblasts, the cells that build collagen, encouraging healthier connective tissue and skin repair.

 

One early study on human fibroblast cells found that low-dose light exposure (around 0.1–0.5 J/cm²) significantly boosted collagen production when applied daily. To put that in context, fluence (measured in J/cm²) is the total dose of light delivered, while irradiance (measured in mW/cm²) is the intensity at a given moment. In this study, the irradiance was estimated at just 2–9 mW/cm².

 

CELLER8 panels are designed to deliver both red (630nm & 660nm) and near-infrared wavelengths at higher, carefully balanced intensities. This means you can reach effective collagen-boosting doses in minutes rather than hours. And because CELLER8 panels cover a broad therapeutic range of irradiance and wavelengths, they support collagen renewal across different skin depths and needs, not just within the narrow range studied in early experiments.

 

PubMed: 8768644

Wound Healing & Tissue Repair

Red light therapy is also widely recognised for its ability to support wound healing and tissue repair. By stimulating energy production inside the cells and encouraging collagen formation, it helps the body’s natural repair processes work more efficiently. This makes it a valuable tool not just for everyday skin recovery, but also for supporting the healing of deeper tissues.

 

A large meta-analysis of 24 studies found that light-based therapy had a highly significant positive effect on wound healing in both humans and animals. The analysis highlighted several key benefits, including faster healing times, greater tensile strength in repaired tissue, increased collagen production, and smaller wound sizes during recovery. It also found that light therapy can help regulate inflammation in the early stages of healing, which is a crucial part of the repair process.

 

Overall, the evidence shows that red light therapy can play a supportive role in tissue repair and regeneration, helping the body heal more effectively.

 

PubMed: 15315732

Hair Growth Support

Red light therapy is one of the most researched non-invasive approaches for supporting hair growth. A 2021 meta-analysis reviewed 15 controlled studies with over 600 participants and found that red light therapy led to a significant increase in hair density in people with androgenetic alopecia (pattern hair loss). The analysis also showed improvements in overall hair thickness and scalp coverage compared to control groups.

 

Most of the studies reviewed used red wavelengths in the 620–678 nm range, with many centred around 650 nm, the same range used by CELLER8 panels (630–660 nm). This wavelength range is believed to penetrate to the level of the hair follicle, where it can stimulate cellular activity, boost energy production (ATP), and support follicle regeneration.

 

CELLER8 panels deliver these key wavelengths not just to the scalp surface but also deeper into the surrounding tissue. For shorter hair, the light can easily reach the follicles, while those with longer hair may choose to part the hair or place the panel closer to the scalp for more direct exposure. Aim for 3–4 short sessions per week, positioning the panel a few centimetres to around 6 inches from the scalp for consistent coverage.

 

Overall, red light therapy has been shown to be a safe and well-tolerated option for encouraging healthier, fuller-looking hair.

 

PubMed: PMC8675345

Improved Energy Levels

Red light therapy is well known for boosting energy at the most fundamental level of the body, the cell. By targeting the mitochondria (the “powerhouses” of our cells), red and near-infrared light increase production of ATP, the molecule that fuels all cellular activity. This extra energy can then be used by muscles, nerves, and tissues to perform, recover, and repair more effectively.


A laboratory study on muscle cells found that exposure to red (630 nm) and near-infrared (850 nm) light significantly increased mitochondrial activity and ATP levels, in some cases by as much as 200–350% compared to baseline. The strongest effects were seen within 3–6 hours after treatment, suggesting both an immediate and lasting boost in cellular energy.


CELLER8 panels combine 480, 630, 660, 810, 830, 850, and 940 nm wavelengths, covering the full range shown in research to support mitochondrial performance, circulation, and recovery. This makes them a powerful, non-invasive way to support higher energy levels, faster recovery, and overall vitality.
 

PubMed: PMC4355185

Pain Relief & Recovery

Red light therapy is one of the most popular ways to help manage pain and inflammation. By working at the cellular level, red and near-infrared light are absorbed by the mitochondria, the “powerhouses” of our cells, where they boost ATP (energy) production, improve circulation through nitric oxide release, and help calm the body’s inflammatory response.

 

A large international consensus review published in 2022 pulled together decades of research and found consistent benefits across a wide range of conditions. The review highlighted that red light therapy can ease pain, reduce inflammation, and accelerate tissue healing by triggering key biological pathways, including gene expression changes that promote repair and reduce pro-inflammatory signals.

 

Overall, the evidence shows that red light therapy is a safe and well-tolerated way to support the body’s natural recovery processes, making it a valuable option for anyone looking to ease pain and inflammation while encouraging better long-term resilience. CELLER8 panels covering a full spectrum of clinically researched wavelengths (630, 660, 810, 830, 850, and 940 nm). 

 

Frontiers: view study

Create Optimal Environment to Heal

One of the reasons CELLER8 users report visible improvements in skin quality, recovery, and overall vitality is that red light therapy doesn’t just work on the surface, it supports the body at a cellular level. By stimulating natural biological processes, red light helps cells produce more energy, reduce oxidative stress, and trigger regenerative pathways that allow the body to restore itself more effectively.

 

At the cellular level, red light therapy enhances mitochondrial function, boosting ATP (the cell’s energy currency) production. This extra energy helps drive essential repair processes, supports collagen and elastin production, and improves overall cellular resilience. These changes are key for skin rejuvenation, wound healing, and maintaining healthy tissue over time.

 

Improved circulation is another key benefit of red light therapy. By increasing blood flow and stimulating angiogenesis (the formation of new blood vessels), it ensures tissues receive more oxygen and nutrients while also assisting in the removal of waste products. This helps speed up recovery, improve skin tone, and create an optimal environment for regeneration.

 

Rather than targeting just one concern, red light therapy works holistically to optimise cellular energy and function. This makes it a powerful tool for skin health, anti-aging, and overall wellbeing.

When Was Red Light Therapy Invented?

Red light therapy began in 1967, when Hungarian physician Endre Mester discovered that low-level red laser light could speed up wound healing and even stimulate hair growth in shaved mice. His findings sparked decades of research into how light interacts with living cells.

 

In the 1980s and 1990s, NASA picked up the thread, testing red and near-infrared LEDs for growing plants in space and uncovering their potential for supporting human health. As LED technology advanced through the 1990s and early 2000s, safer and more practical devices became possible, leading to the first FDA approvals and clinical adoption.

 

Today, red light therapy is no longer confined to labs or hospitals. Devices like our red light panels make use of multiple therapeutic wavelengths in a way that’s powerful, accessible, and designed for everyday use

How Red Light Therapy Works

Red light therapy works by delivering specific wavelengths of red and near-infrared light to the body, which stimulates your cells particularly the mitochondria, known as the energy factories of your cells. One key enzyme in the mitochondria, called cytochrome c oxidase, absorbs this light and becomes more active. This leads to a boost in the production of ATP, the main energy currency of the body, giving your cells more fuel to heal, repair, and perform their functions better.

 

Another important effect is the release of nitric oxide, a gas that can build up and block cellular energy production. Red light therapy helps displace this nitric oxide, allowing mitochondria to work more efficiently while also improving blood flow and oxygen delivery throughout the body.

 

Red light therapy also helps balance calcium levels through light-sensitive ion channels and activates signaling molecules like reactive oxygen species (ROS), cAMP, and nitric oxide. These signals trigger important biological responses such as reducing inflammation, fighting oxidative stress, boosting antioxidant production, and activating genes involved in healing and regeneration.

 

Stem cells and other regenerative cells respond especially well to this light, which helps explain why red light therapy can support everything from faster injury recovery and muscle repair to skin rejuvenation and even improved brain function. Unlike UV light, it doesn’t damage DNA or burn the skin, making it a safe, non-invasive tool to help the body heal, repair, and thrive from the inside out.

Apply Red Light Therapy

Signalling Molecules Released

- Light absorbed by mitochondria (cytochrome c oxidase)

- Boost in ATP production (up to 300%)

- Release of nitric oxide (NO)

- Reduction in oxidative stress

Knock-on Benefits

- Improved skin health

- Improved collagen production

- Enhanced wound healing & tissue repair

- Reduced pain & inflammation

- Better circulation

- Support for muscle recovery  

- Support for joint health

- Improved mood & energy levels

- Mitochondrial support

Apply Red Light Therapy

Cellular Response

- Light absorbed by mitochondria (cytochrome c oxidase)

- Boost in ATP production (up to 300%)

- Release of nitric oxide (NO)

- Reduction in oxidative stress

Knock-on Benefits

- Improved skin health

- Improved collagen production

- Enhanced wound healing & tissue repair

- Reduced pain & inflammation

- Better circulation

- Support for muscle recovery  

- Support for joint health

- Improved mood & energy levels

- Mitochondrial support

Will Red Light Therapy Work for My Condition?

Yes. While red light therapy is not condition-specific, it works by supporting your body’s natural healing processes at a cellular level. Red and near-infrared light penetrate the skin and stimulate your mitochondria, the energy centres of your cells, helping to boost ATP production, reduce inflammation, and improve blood flow. By creating a more energized and balanced internal environment, red light therapy can support recovery, reduce pain, and improve overall function. Whether you're managing skin issues, muscle or joint pain, slow healing, fatigue, or just aiming to optimise your wellness, red light therapy helps your body restore and thrive from the inside out.

Understanding Red Light Specifications

Wavelengths (nm)

When we talk about “wavelength,” we’re referring to the distance between peaks of light waves, measured in nanometres (nm). Different wavelengths of light penetrate the body to different depths and interact with tissues in different ways.

 

For example, red light (around 630–660nm) is absorbed mainly in the surface layers of the skin. That makes it especially useful for things like skin health, collagen support, circulation, and hair growth. In contrast, near-infrared light (810–850nm and beyond) travels much deeper, reaching muscles, joints, and even bone making it valuable for recovery, deeper-tissue repair, and circulation.

 

Our red light therapy panels are designed to give you the best of both worlds, with a precise blend of 7 therapeutic wavelengths that target multiple layers of the body:

 

480nm (Blue Light) – Supports skin health by targeting blemishes and promoting balance.

 

630nm & 660nm (Red Light) – Stimulates collagen production, improves circulation, and supports skin healing.

 

810nm, 830nm & 850nm (Near-Infrared Light) – Reaches deeper muscles and joints to promote recovery and performance.

 

940nm (Deep Near-Infrared Light) – Enhances oxygen delivery, boosts circulation, and supports nerve function at a cellular level.

 

This means that every CELLER8 session delivers light across the spectrum, from surface-level skin benefits to deep-tissue support, without you having to switch devices.

Irradiance (mW/cm²)

Irradiance is a measure of how much light energy reaches your skin, expressed in milliwatts per square centimetre (mW/cm²). The higher the irradiance, the more energy your body receives in a shorter amount of time. For example, standing closer to a panel gives a stronger dose, while moving further away spreads the light out and lowers the intensity. Balance is key, enough irradiance to be effective, without overdoing it.

 

When brands advertise the “power” of their red light therapy devices, they usually mean irradiance. Think of it as the intensity or brightness of the therapeutic light, but measured in a scientific way. But here’s the catch: the tool used to measure it makes all the difference. 

 

Solar meters - Solar meters are designed for broad sunlight, not therapeutic wavelengths. They also pick up heat and stray light, so they often inflate numbers, making a panel look stronger than it really is. Some brands use this to their advantage in marketing.

 

Light spectrometers - Spectrometers, on the other hand, break down the exact wavelengths a device emits (e.g. 630nm, 660nm, 810nm, etc.) and measure irradiance at those precise points. This makes them the gold standard for red light therapy testing, because they show the true amount of therapeutic light reaching your skin.


Some companies blur the lines, claiming “spectrometer readings” but actually including inflated solar meter data. Unless you look closely, it can seem like their device was measured to scientific standards when it wasn’t. At CELLER8, we publish both solar meter and spectrometer data so you see the full picture. But only spectrometer results show the true therapeutic output of our panels. No shortcuts, no inflated claims, just accurate numbers you can trust.

Dose (J/cm²)

When we talk about dose in red light therapy, we’re usually referring to the amount of light energy your skin or tissue actually receives. The standard way of measuring this is in joules per square centimetre (J/cm²).

 

Joules (J) = the total amount of energy delivered.

cm² = the area of skin it’s delivered to.

 

Think of it like watering a plant: irradiance (measured in mW/cm²) is how strong the stream of water is at any moment, while dose (J/cm²) is how much total water the plant gets after a few minutes.

 

If you stand about 12 inches away from the CELLER8 full body panel, your skin receives roughly 50 mW/cm². After just 200 seconds (3.5 minutes), that equals a dose of 10 J/cm²

Beam Angle

Beam angle refers to how widely the light spreads as it leaves a red light therapy panel. A narrow beam keeps the light highly concentrated, while a wider beam spreads it over a larger area but reduces depth. Getting this balance right is key to making a panel both effective and practical.

 

CELLER8 panels use a 30° beam angle, carefully chosen to deliver strong penetration into skin and tissue while still covering a broad area. This means you don’t just get light on the surface, but also at the deeper levels where it can make the biggest impact.

 

For example, although the CELLER8 full-body panel is 41.5 cm wide, the beam spreads outward as you move away from it. At a distance of 6 inches, coverage expands to around 56 cm, and at 12 inches it reaches roughly 71 cm. So, while the panel itself has a fixed size, the light footprint you receive in a session is significantly wider.

 

In practice, this beam angle allows CELLER8 panels to provide both focused intensity when used close-up and efficient coverage when standing further back for full-body sessions. It’s this balance that makes the panels versatile enough for everyday use.

Low EMF (0µT at X inches)

EMF stands for electromagnetic fields, the invisible fields of energy that come from electrical devices. While everyday electronics like phones, laptops, and Wi-Fi routers all give off some level of EMF, many people in the health and wellness space prefer to keep their exposure as low as possible.

 

That’s why EMF levels are measured in microteslas (µT), a standard unit of magnetic field strength. Independent testing shows that CELLER8 red light therapy panels produce 0µT at 3 inches, which is effectively no measurable EMF at the distance you’d typically stand or sit during a session.

 

In other words, you’re getting the therapeutic light you want, without unnecessary electromagnetic exposure. It’s one more way CELLER8 is engineered for safe, daily use.

Pulsing & Continuous Light (Frequency - Hz)  

Most red light devices operate in one of two ways: continuous wave (the light is on the whole time) or pulsed (the light rapidly turns on and off at a set frequency, measured in Hertz or Hz).

 

Continuous light is the classic approach. It delivers a steady stream of photons to your tissues and is the method used in most studies. This is reliable, safe, and highly effective for the majority of goals.

 

Pulsed light is more experimental, but growing research suggests it may have unique benefits. Because the light switches on and off, tissues get “recovery moments” between pulses, which may allow for: deeper penetration without overheating the skin, enhanced cellular signalling and possible effects on brainwave activity, particularly at lower frequencies (like 10 Hz), which are linked to relaxation, recovery, and cognitive support.

 

CELLER8 gives you the freedom to choose both. You can run treatments in continuous mode, or experiment with pulsing across a wide frequency range (2.5–10,000 Hz). This lets you match settings to different goals, whether you want gentle recovery support, deep tissue work, or neurological optimization. And unlike cheap panels that can flicker unintentionally (causing eye strain and headaches), CELLER8 is flicker-free, meaning you get precise, controlled light delivery and never the unwanted side effects.

Other Specifications

Number Of LEDs: The number of LEDs determines how much light the device can deliver at once. More LEDs mean higher total output and broader coverage. For targeted use, the CELLER8 Desktop Panel has 70 LEDs, making it ideal for focused treatments at a desk or bedside. In contrast, the CELLER8 Full-Body Panel uses 840 LEDs, designed for full-body coverage in a single session. Both use the same carefully chosen therapeutic wavelengths, but the scale of light delivery changes depending on your needs.

 

Lifespan: LED quality matters. A long lifespan means consistent performance over years of use, without needing to worry about fading light output. Both CELLER8 Desktop and Full-Body Panels are rated for over 100,000 hours of use, which is equivalent to leaving the red light panel on consistently for 4,166 days or over 11 years! So decades of daily sessions. This durability makes either option a solid long-term investment. 

 

Power Consumption: Power consumption reflects how much energy a device draws. The CELLER8 Desktop Panel uses 91W, perfect for focused, efficient sessions at close range. The Full-Body Panel uses 1092W, delivering enough power to saturate a much larger area with therapeutic light. Both strike a balance between efficiency and performance for their intended use.

 

Input voltage: A wide input voltage range means your panel is travel-friendly and compatible worldwide. Whether you’re at home or abroad, CELLER8 panels are designed with a 100–250 volt input range, so they can be safely used almost anywhere without adaptors or special setups.

Red Light Therapy Studies

Since the 1960s, 8,000+ studies have investigated red and near-infrared light therapy, exploring its effects on everything from skin health and wound repair to energy metabolism and eye function with almost 90% of these studies have very positive outcomes. Some applications have even been cleared by the FDA, reflecting the strength of the evidence base. We’ve reviewed a wide range of this research and translated it into easy-to-understand insights. Wherever possible, we highlight the wavelengths and treatment times used in studies, so you can see how they connect to real-world use. Because CELLER8 panels offer both red (630 & 660 nm) and near-infrared (810–940 nm) wavelengths, alongside fully adjustable intensity and session length, you can closely align your own sessions with the parameters explored in the scientific literature.

Common Uses in Dermatology

Red light therapy (RLT), delivered through LEDs, has become one of the most widely studied and safest non-invasive treatments in dermatology. Unlike lasers, LEDs are gentler, cheaper, and can cover larger areas without damaging the skin. Their effects come from photobiomodulation, where light at specific wavelengths interacts with cellular energy systems, influencing processes like ATP production, oxidative stress, collagen synthesis, and inflammation.

 

Because different wavelengths penetrate the skin to different depths, RLT can be applied to a wide range of conditions. Red light (630–700 nm) is able to reach the dermis, stimulating fibroblasts to boost collagen production, improving skin texture, elasticity, and reducing fine lines. Blue light (400–470 nm) remains closer to the skin surface and is particularly effective for acne, thanks to its antimicrobial effects on P. acnes bacteria. Yellow light (~540 nm) has been shown to calm redness, pigmentation issues, and swelling, while near-infrared light (700–1200 nm) penetrates deepest, supporting wound healing and tissue repair.

 

Clinically, RLT is commonly used for acne, where blue and red LEDs together reduce sebum, bacterial activity, and inflammation. It has also shown benefits in rosacea and eczema, helping calm chronic inflammation and reduce visible irritation. In psoriasis, blue and red light have demonstrated improvements in erythema and scaling. RLT is also increasingly popular in anti-aging and skin rejuvenation, where studies report improved collagen density, reduced wrinkles, and healthier complexion.

 

Beyond inflammatory skin conditions, RLT is now recognised in dermatology for addressing precancerous lesions such as actinic keratosis, sometimes with results comparable or superior to cryotherapy. It has also been trialled for certain non-melanoma cancers like superficial basal cell carcinoma. In hair restoration, red and near-infrared LEDs have been cleared by the FDA for treating androgenetic alopecia, where they help stimulate follicles and improve hair counts. Finally, near-infrared LEDs support wound healing by increasing blood flow and promoting tissue regeneration.


PubMed: 30006754

Eye Health & Vision Support 

As we age, the mitochondria in our eyes, that produce cellular energy (ATP), begin to slow down. This is particularly true in the cone cells of the retina, which are responsible for colour vision. Over time, this decline can make colours appear less vivid and overall vision feel less sharp.


Red light therapy (RLT), particularly in the long wavelength range of 650–900 nm, has been shown to help boost mitochondrial efficiency and restore some of this lost energy. By improving how mitochondria work, red light can support the function of ageing cone cells and, in turn, enhance colour sensitivity.


In a recent human study, adults aged 34–70 were exposed to just three minutes of 670 nm light in the morning. When tested later, their colour contrast sensitivity had improved by up to 17%, with benefits still measurable a full week later. Interestingly, when the same exposure was given in the afternoon, no improvements were seen, suggesting that the timing of red light makes a big difference.


This research highlights how even a brief exposure to the right wavelength of red light can support healthier vision in later life by helping the eye’s energy systems perform more like they did in youth.


Nature: 41598-021-02311-1

Skin Fibrosis

Fibrosis develops when fibroblasts overproduce collagen, leading to stiff, scar-like tissue that replaces healthy skin. Conditions such as keloids, hypertrophic scars, and scleroderma are examples of this process, and they often resist current treatments. Red light therapy (RLT), through photobiomodulation, has been investigated as a safer alternative to existing therapies because of its deeper penetration and lack of UV-related risks.

 

This study explored how red light at high fluences (320–640 J/cm²) affects gene activity in human dermal fibroblasts. Using RNA sequencing, researchers found that RLT triggered widespread transcriptional changes within just a few hours of treatment. Importantly, it upregulated MMP1, a collagen-remodelling enzyme that breaks down excess collagen, and PRSS35, a gene linked to anti-fibrotic activity. Both results point to a potential mechanism where red light directly helps to remodel scar tissue.

 

The study also confirmed increased MMP-1 protein levels after treatment, alongside reduced fibroblast proliferation and increased reactive oxygen species (ROS), which are known to play a role in regulating fibrotic pathways. Together, these effects suggest that RLT shifts fibroblasts away from a pro-fibrotic state and towards tissue remodelling.

 

In conclusion, high-fluence red light was shown to influence key pathways linked to collagen production, proliferation, and oxidative stress in skin fibroblasts. By boosting enzymes that degrade excess collagen and altering fibrosis-related gene expression, RLT may hold therapeutic potential for treating skin fibrosis and related conditions.


Nature: 41598-021-86623-2

Red Light Therapy (PBM) FDA Approvals

2002 – FDA cleared PBM devices for relief of minor muscle and joint pain, arthritis, muscle spasms, and increasing local blood circulation.

2003 – FDA cleared PBM for muscle relaxation and stiffness reduction as an adjunctive therapy in physical medicine.

2009 – FDA cleared low-level light therapy (LLLT), a form of PBM, for treatment of carpal tunnel syndrome.

2010 – FDA cleared laser and LED caps for treatment of hair loss (androgenetic alopecia) in both men and women.

2013 – FDA cleared PBM for reducing pain and stiffness associated with knee osteoarthritis.

2018–present – Continued FDA clearance for red light devices for wrinkle reduction, wound healing, and supporting recovery after cosmetic procedures (depending on device and claim).

Does Red Light Therapy Need Direct Skin Contact?

For best results, red light therapy should reach your skin directly. Clothing blocks or scatters most of the wavelengths, so bare skin exposure is much more effective than shining the light through fabric. That’s why most people use their panels at home while wearing shorts, a sports bra, or similar. 

 

Most of the benefits happen in the area you shine the light on. For example, targeting your knee will primarily affect the skin, tissue, and muscles in that spot. However, research also suggests there can be wider “systemic” effects, since red and near-infrared light support mitochondrial function and blood flow. This means some benefits may extend beyond the treatment area. That’s why CELLER8 offers both full-body panels for broader coverage and compact, localised devices when you want to focus on a specific area.

The Arndt–Schulz Law (Biphasic Dose Response)

The Arndt–Schulz law explains that living systems respond differently depending on the strength of a stimulus. Very small doses may have little effect, low to moderate doses can be stimulating and beneficial, while very high doses may actually reduce or inhibit activity. This “biphasic dose–response” (also called hormesis) shows why more is not always better.

 

What makes it relevant here is that red and near-infrared light follow this same biphasic pattern, small to moderate amounts stimulate cells, but excessive exposure may blunt the effect.

 

In practice, this means you’ll get the best results from short, consistent sessions at a comfortable distance rather than very long or overly intense exposure. For most people, that looks like a few sessions per week, positioned close to the skin, allowing light to reach the cells without overdoing it. CELLER8 devices are designed to keep you within this effective range, making it easy to stay in the “sweet spot.”

Is Red Light Therapy Safe?

Yes, red light therapy is considered very safe when used as directed. Unlike ultraviolet (UV) light, it does not damage DNA or cause sunburn. Instead, it uses non-ionising wavelengths that gently stimulate your cells. Side effects are rare and usually limited to mild, temporary skin warmth or redness if the device is used too close for too long. CELLER8 devices are tested for low EMF emissions and built with safety certifications such as CE and FDA registration, so you can feel confident using them at home or in professional settings.

Are There Any Side Effects of Red Light Therapy?

Red light therapy is generally very safe, with very few reported side effects. Unlike UV light, it doesn’t burn or damage DNA. The most common effect is mild warmth or slight skin redness if you’ve used the device very close for a long session, but this usually fades quickly. Sensitive individuals may also feel temporary eye strain if they stare directly into the LEDs, which is why it’s best to glance away or use eye comfort measures. All CELLER8 devices are low-EMF, certified, and designed for safe daily use at home or in professional settings.

Red Light Therapy Contraindications & Cautions

Pregnant Women – While no studies suggest harm, it's best to consult a healthcare provider before using red light therapy during pregnancy.

 

People with Photosensitivity – If you have light sensitivity disorders (e.g., lupus, porphyria) or take medications that increase photosensitivity (e.g., certain antibiotics, acne medications, or chemotherapy drugs), consult your doctor before use.

 

Individuals with Active Skin Cancer or Tumors – Red light therapy may stimulate cell activity, so it should be avoided over cancerous lesions unless advised by a medical professional.

 

People with Epilepsy or Seizure Disorders – Some individuals with epilepsy may be sensitive to bright light exposure. If you have a history of photosensitive epilepsy, consult a doctor before use.

 

Those with Retinal Conditions or Recent Eye Surgery – While red light therapy can be beneficial for eye health, direct exposure to strong LEDs should be avoided after eye surgery or if you have retinal damage. Always use protective eyewear if needed.

FAQs

Can red light therapy burn the skin?

No. CELLER8 panels use non-UV light, so they don’t burn or tan the skin. They provide gentle, therapeutic wavelengths only.

Can red light therapy improve vision?

Some research suggests low-level red light may help support healthy ageing in the eyes by improving mitochondrial efficiency in the retina. However, these are early-stage findings so think of any benefits as a possible “bonus,” not a primary use case.

Is a full-body panel better than a smaller device?

It depends on your goals. A full-body panel offers the most comprehensive coverage. Ideal if you want systemic benefits, convenience, and to save time by treating large areas at once. A smaller desktop or handheld device is better for targeted support, such as focusing on the face, scalp, or a sore muscle group. With CELLER8, you can choose either option (or even combine them), since both panels use the same clinically-relevant wavelengths and intensity, only the coverage area changes.

What does ‘photobiomodulation’ mean?

Photobiomodulation is simply the scientific term for red light therapy. Broken down, “photo” means light, “bio” refers to life or living systems, and “modulation” means change or influence. In other words, it’s the process of using light to positively influence biology. Scientists prefer this technical term because it captures both the red and near-infrared spectrum and the wide range of biological effects studied in clinical trials. For users, it’s easier to think of it as “red light therapy” a safe, non-invasive way of giving your cells a boost of usable energy.

How is red light therapy different from regular light therapy or infrared saunas?

“Light therapy” is an umbrella term, it can mean anything from sitting under bright light for seasonal mood support to using ultraviolet light in dermatology. Red light therapy is more specific: it uses targeted red and near-infrared wavelengths that interact with your cells, particularly the mitochondria, to support energy production and recovery. Infrared saunas, by contrast, use far-infrared heat to raise your core body temperature and make you sweat. With red light therapy, you won’t feel that same heat or detox effect, it’s a non-invasive, non-sweat approach that delivers light energy deep into tissues without overheating the body.

Red Light Therapy & Tattoos

One of the most common questions we hear is: “Will red light therapy fade my tattoo?” The good news is no! Unlike sunlight and UV exposure, red light therapy doesn’t fade tattoo ink.

 

In fact, many people use red light therapy to support their skin before and after getting a tattoo. Tattoos are essentially controlled skin trauma, and wavelengths like 630nm and 660nm (both included in CELLER8 panels) are well studied for their ability to support skin quality, calm redness, and aid natural recovery. Using red light in the weeks before getting a tattoo can help condition the skin, and aftercare sessions may support the healing environment.

 

If you already have tattoos, CELLER8 can still be used confidently for overall skin health, recovery, and wellbeing — without worrying about colour loss.

Red Light Therapy & Sunburn

“Sunburn isn’t just uncomfortable, it’s a form of skin damage caused by UV radiation. Beyond redness and soreness, repeated burns are linked to premature ageing and long-term skin issues. While nothing replaces sensible sun protection (shade, clothing, mineral sunscreen), red light therapy has been studied for both preventing and soothing sunburn.

 

Pre-conditioning the skin: Studies show that pre-treating skin with 660nm red light can reduce redness and delay the onset of UV-induced burns. In some cases, it acted almost like an SPF-15 buffer.

 

Calming inflammation: Red and near-infrared wavelengths (like CELLER8’s 630nm, 660nm, 810–850nm) are known to help regulate oxidative stress and inflammatory pathways in skin cells, supporting a faster return to balance after sun exposure.

 

Supporting repair: By stimulating mitochondria and improving circulation, red light encourages the skin’s natural repair processes, including collagen and elastin production, which can be useful for both prevention and aftercare.

 

Unlike sunlight, which bombards your skin with the full spectrum (including UV), CELLER8 panels deliver only targeted therapeutic wavelengths. With both 630nm and 660nm plus near-infrared, they provide the blend shown to be most relevant for skin health without heat or UV risk.

 

Before sun exposure: Short, consistent sessions may help condition the skin over time, making it less prone to UV redness.

 

After mild sunburn: Sessions of around 5–10 minutes, once or twice daily at close distance (a few cm to 6 inches) can help calm redness and support recovery.

 

As part of skin care: Regular use contributes to overall skin resilience, complementing your sun-safe habits.

What’s the difference between a solar meter and a light spectrometer?

When companies advertise the “power” of their red light therapy devices, they usually refer to irradiance (measured in mW/cm²). But the tool used to measure it makes all the difference.

 

Solar meters - A solar meter is designed to measure broad sunlight, not specific therapeutic wavelengths. Because it picks up stray light and heat, it often overestimates the true power of a red light panel. That’s why some brands use solar meters to inflate their numbers and make their device look stronger than it really is.

 

Light spectrometers - A spectrometer, on the other hand, breaks down the exact wavelengths of light being emitted (e.g., 630nm, 660nm, 810nm, etc.) and gives an accurate measurement of irradiance at those specific points. This is the gold standard for measuring red light therapy devices, because it tells you what’s actually reaching your skin at therapeutic wavelengths.

 

Watch out for misleading claims! Some companies add disclaimers like “Measured with a spectrometer for accurate numbers”. But if you look closely, they may have actually used both tools, recording inflated solar meter results but labelling them as spectrometer data. Unless you read carefully, it looks like the device was measured to scientific standards when it wasn’t. At CELLER8, we publish both solar meter and spectrometer readings so you can see the full picture. But only the spectrometer data tells you the true therapeutic output of the panel. No shortcuts, no inflated claims.

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Disclaimer

The CELLER8 Red Light Therapy device is used for applying Red Light Therapy sessions. It does not claim to treat or cure any medical illnesses and you should always discus any medical concerns with your doctor.