What are the Health Benefits of Red Light Therapy

Red Light Therapy and Near-Infrared Therapy Biological Effects


The written article is based on a summary of existing literature on the topic of red light therapy (also LLLT). The article is for educational purposes and the information provided below cannot be taken as a promise to help with acute health problems or diseases.

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Most people think of light as something that only allows for visibility of their direct environment. (Sun)light, for instance, allows you to see what’s going on around you. And at nighttime, the absence of light makes your environment invisible.

Sounds simple, right?

For health, however, there’s more to the story:

In fact, the light in your environment directly affects your health. Sufficient levels of light exposure, in fact, is essential for the human body!


That statement sounds really abstract so allow me to explain:

For millions of years, sunlight was the main light source in the human environment. Those brightness-providing sun rays actually penetrate the skin's surface. In other words, light can thus directly venture into your body to affect chemical processes therein1;2.

Today, many people spend most of their time indoors - artificial light bulbs have become the main source of light exposure for humans.

To understand why that difference matters, let’s dig a bit deeper into what “light” is:

From a physics perspective, light is made up of “wavelengths”. Some of those wavelengths of light - such as far infrared - warm the body from within. As a result, you’ll get feelings of a greater sense of well-being, have more energy, and perform better.

When you’re outside, the wavelengths emitted by the sun provide you with that feeling. If you’re indoors all the time, you won’t get sufficient light exposure, and unfortunately, won’t reap those benefits

Let’s consider why that matters:

The sun emits several different wavelengths. To be more precise, the sun emits 1) visible (all the colors of the rainbow); 2) infrared (IR) and; 3) ultraviolet (UV) wavelengths or light.

And you know what’s really interesting?

You absorb those wavelengths through photoreceptors located in the skin. Your body also converts the light into energy3. That process works similarly to the well-known metabolic progress “photosynthesis”4. In photosynthesis, plants use light to convert carbon dioxide into oxygen. Photosynthesis is essential for all plant life on earth.

In your cells, that process is essentially reversed!

Let’s explore that relationship between light and your body a bit further:

Without going into too much detail, the energy-producing processes in your cells are also affected by light in your environment. That basic process of light absorption by photoreceptors brings many fundamental health benefits.

Clearlight Saunas offers far-infrared and full spectrum infrared saunas that use infrared wavelengths to heat you up from the inside. In this article, however, I will not cover that specific topic.

Instead, I’ll break down the latest studies around “red and infrared light therapy” in this blog post in simple to understand terms. I’ll also talk about the benefits of this therapy and I consider some commonly-asked questions.

Contrary to using an infrared sauna, red and infrared light therapy barely heats your body up, but it does provide your body light that penetrates deep into your tissues.

Let’s explore that statement some more:

Red and infrared light therapy” contains to two primary forms of light:

  1. Red light.
  2. Near infrared light, which is a small piece of the infrared (IR) spectrum.

Here´s a deeper explanation of the wavelengths used in red and infrared light therapy:

  • First, red light is made up of wavelengths between ~ 620 and 780 nanometers in length.
  • Secondly, near infrared light wavelengths are found between 780 and 1,400 nanometers.
  • Lastly, wavelengths above 1,000 - which heat your body up - are not used in red and infrared light therapy - so we won’t discuss those in this article. In other words, only infrared between 780 and 1,000 nanometers is commonly used.

(If you’re not a physics geek then there’s no need to remember those numbers)

This red and infrared light therapy I’m talking about is also frequently described with other names, such as “Low Level Laser Therapy (short: LLLT)”, “LED light therapy”, “photobiomodulation”, and “red light therapy”.

(To keep things simple, I’ll go with the name “red light therapy” in this article)

So let’s consider why red light therapy is so different from anything else on the market today:

History Of Red Light Therapy

In this section I’ll dig deeper into the basics of red light therapy and how it developed:

Red light therapy has been used for decades, although, mostly through lasers. Consumer red light therapy, on the other hand, has only been used extensively for about a decade.

Consumer red light therapy almost exclusively uses LED lights, instead of lasers, which are much safer to apply5. When you’re using LEDs, there’s (almost) no risk of damaging any tissues, except for under the most extreme circumstances.

The red light therapy sold by Clearlight Saunas Australia & New Zealand supplier of Jacuzzi® Saunas exclusively uses those side-effect friendly LEDs.

So let’s consider why LEDs are used in the first place:

Contrary to infrared saunas, red light therapy functions almost exclusively based on light and has a very low heat component. In other words, an infrared sauna heats you up from the inside while red light therapy provides you with light that penetrates deep into your body.

In northern Europe, the classic incandescent heat lamps have traditionally been very popular. These bulbs are mainly used for sinusitis or muscular tension.

Whilst these incandescent heat bulbs also produce small amounts of red and near infrared light, these lamps have nowhere near the same benefits and intensity as their red light therapy counterpart6.

Fortunately, the red light therapy industry in Australia, as well as its applications, have grown exponentially in the last few years. New panels that emit new wavelengths and different treatment protocols hit the market every single week.

What’s amazing is that red light therapy has been very extensively researched in thousands of studies. When the correct treatment parameters are used in these studies, about 85% of these thousands of studies show positive results7.

Due to these promising scientific findings, red light therapy quickly established itself among athletes and Olympic participants the last few years. Natural health clinics and healing centres have also integrated this form of therapy for accelerated recovery to assist their wide range of patients and customers.

Red light therapy has, in fact, taken the health industry by storm. Michael Hamblin, a Harvard University professor, thinks that within a decade, most homes will have a red light therapy device.8

This snippet explores the history of the scientific research conducted on Red Light Therapy.

Let’s then explore that “next big thing” some more.

How Does Red Light Therapy Work?

Remember that thanks to photoreceptors in the human body, your skin naturally absorbs and metabolizes the incoming light (a.k.a. radiation).

Not all light is created equal though. All these wavelengths or rays of light have a different effect or are absorbed differently by the skin.

One classic example is the effect of sunlight on the skin, which, among other things, ensures that the human body can produce vitamin D9. Part of the ultraviolet light spectrum initiates the physiological creation process of vitamin D.

In red light therapy, two specific ranges of light wavelengths complement with each other, which, when used together, cause the effect of “photobiomodulation”.

Let’s break down that term “photobiomodulation”. In latin, “photo” stands for “light”, “bio” denotes “biology”, and “modulation” signifies “change”. “Photobiomodulation” thus means “light modulation biology” or, simpler: “light changing life”

Phrased differently, the term “photobiomodulation” describes the metabolism of light energy into electrochemical energy in the human body.

Put in more plain terms, light that enters your body influences the chemical and electrical processes in your body10. Every single biological process in your body depends on chemistry and electricity (and their interaction).

Or, even simpler: light energizes your body.

As a result, the effects of this supplied energy are versatile.

If you would like to learn more about how red light therapy works, click here.

This snippet speaks on how Red Light Therapy works.

What Does Red Light Therapy Do?

Let's look at the biological effects.

For the effect of photobiomodulation to occur, you require two specific wavelength ranges which I’ve talked about earlier:

  1. red light in the visible range of 600-670 nanometres (nm)
  2. near infrared light in the range of 800-860 nanometers (nm)

The merging of these two parts of that light spectrum, at a sufficient intensity, guarantees the process of photobiomodulation is effective. Only using the right parameter will thus result in the desired health benefits.

In other words, if the light output of a panel is very low, you won’t get much if any benefit. Moreover, many wavelengths do not guarantee the desired effect, which is why classic red light lamps do not promote the same health outcomes.



If you were to use the 710 nm wavelength, you won’t get the same benefits as you would by using 630 nm or 810 nm11.


Well, one mechanism of certain wavelengths of light is that they activate biological processes in your cell’s “mitochondria”. Scientists consider those mitochondria the “the power plants of your cells”.

Mitochondria have a variety of functions in the cells, in particular they are responsible for the production of adenosine triphosphate (ATP). ATP acts as an energy store in the cells and thus, fuels the body. Within a very short time after exposure to the correct wavelengths, the mitochondria upgrade their power station function and produce more fuel as ATP.

The increased ATP production, in turn, leads to more energy in the cells and subsequently the body.

(Alternative theories about the cell’s energy-generation exist that I won’t go into here)12

The bottom line is this: you need the right red light therapy panel with the correct wavelengths and a high light output.

Curious yet?

Let’s then take a look at what health benefits you can expect from this therapy.

What are Red Light Therapy Health Benefits?

The list of health benefits is impressively long and will examine them individually below.

In summary, it can be deduced above all that increased cell health or increased cell frequency is an ideal prerequisite for many processes that support a healthy body and mind!

That dynamic is often compromised by stress in everyday life, chronic fatigue, insufficient nutrition and insufficient movement/exercise. All these consequences can also lead to the weakening of the immune system.

At the cellular level, the cell function is reduced and the human body has less energy for vital processes.

For instance, these negative factors lead to an increase in a compound called “nitric oxide” (NO). This increase may be harmful when nitric oxide binds the enzyme cytochrome C-oxidase (CCO).

Without overcomplicating too much, “COO” is part of the energy-creation process in the cell and needed for cell health. Adding red light therapy will break down the bonds between NO and CCO, therefore increasing overall cell health.

(Phrased differently: COO compromises one necessary step of the energy-creation process in the mitochondria - COO is highly dependent on red and infrared light as an input to function optimally)13.

1. Pain Relief

Red light therapy is proven to naturally reduce pain. Studies have shown, in fact, that red light therapy treatments can alleviate things such as chronic back pain, muscle pain, and knee and joint pain (14).

It has also been demonstrated that red light therapy can improve overall healing results after injuries and surgeries, reducing the need for pain medication or other over-the-counter drugs.

That potential pain relief provided by red light therapy results from increased blood circulation within the body, especially to damaged tissue (15).

Furthermore, red light therapy also has the effect of photobiomodulation: an increase in ATP in the mitochondria is achieved, which gives your cells more usable energy and thus enables them to function better.

If a physiological dysfunction is the cause of the (chronic) pain, removing that dysfunction may thus reverse the presence of pain.

And, zooming out again, that optimisation of the functions of the cell is directly linked to faster regeneration of damaged tissue; the body’s own immune system can therefore act stronger and faster to repair internal damages (16).

Hence, several pathways exist through which red light therapy reduces pain. Moving on to the second benefit:

2. Reduce Inflammation (One Of The Main Causes Of Chronic Health Diseases)

Initial research results indicate that red light therapy can help reduce excess inflammation in the body. An excess of inflammation is detrimental to your overall health in many different ways.

Hence, the possibility of lowering inflammation by red light therapy is a very welcome one. Let’s explore the results of current scientific studies:

In a 2010 study, positive developments in inflammation levels within the muscular level were found. That inflammation typically occurs during heavy strain from sports.

When red light therapy was used right before athletic endeavours, moreover, it resulted in pain relief and a shorter regeneration phase (17).

(For you, as an athlete, a shorter regeneration period entails you’re able to train or compete more frequently with a full recovery!)

Additionally, pain relief is observed in various forms of arthritis when red light therapy is regularly applied. A reduction of swelling (associated with arthritis) and stiffening resulted as well. These initial results are fantastic, as people with arthritis often live in pain and also have compromised mobility (18).

The above outcomes can be explained through the aforementioned “photobiomodulation” (i.e. “light shaping life”). Due to the supplied energy by both red and near-infrared light, the production of ATP in the mitochondria is stimulated. Due to the increase in ATP, the body's own processes, such as the supply of blood and oxygen to the muscles, are more efficient and intensive.

Next, here’s another benefit many men and especially women will love:

3. Skin Rejuvenation (Increases In Collagen And Elastin Production)

In the beauty industry, various forms of red light therapy have been known for a long time and are used regularly, especially by stars and celebrities. The main reason for this therapy is the reduction of inflammatory symptoms in the skin. Due to increased blood and oxygen circulation, the damaged skin tissue can be repaired more quickly, resulting in increased regeneration and better overall looks (19).

In fact, many people already report younger-looking skin after their first red light therapy sessions (Yes, even 20 and 30-year-olds frequently notice a difference).

Red light therapy, for instance, results in an increase in the body's own collagen (20). Collagen is a protein produced naturally in the body, which among other things provides structure and stability, e.g. in bones or in the skin.

Increased production of collagen through an application of red light therapy can therefore also lead to an improvement in the skin's appearance, which is why it has long been used in the beauty industry.

Fortunately, red light therapy now allows consumers all over the world to access these skin rejuvenation benefits. In the past, you needed to visit an expensive clinic to get these results.

Today you’ve got access to red light therapy at your fingertips!

And there’s more:

4. Muscle Recovery And Conditioning

Exciting results have also been achieved in terms of muscle recovery and conditioning. Improvements in muscle activity have been recorded in terms of strength, endurance and general performance improvement.

For instance, applying red light therapy results in an increase in maximal muscular upper-body strength and an increase in grip strength (21; 22). Similar results are obtained with regard to leg strength.

These health benefits are recorded in both women and men - both sexes attain an increase in overall strength after several sessions!

Here’s why that outcome is remarkable:

As a result of quicker recovery, you’ll experience an increase in general performance and a shortening of the regeneration phase. That combination is very exciting for both amateur and professional athletes because you’ll have an edge over the competition!

As the CEO of Clearlight Infrared Cabins, I expect the use of red light therapy on the performance level to be increasingly accepted in society in the coming years.

5. Improved Thyroid Health

The human hormone balance is a complex scientific topic. The interrelationships of hormones, basic physiology, and overall human health are currently heavily scientifically researched all around the world.

Right now, research is looking at how red light therapy affects the thyroid, one of the most important hormone glands in the human body. When fully functional, it regulates the balance of many downstream hormones.

Without a properly functioning thyroid, for instance, your body cannot optimally create:

  • stress hormones that make you feel awake, such as adrenaline
  • hormones involved with feeling well, sexuality, and fertility, such as testosterone. Testosterone also helps both men and women feel strong.
  • hormones involved with kidney function.
  • thyroid hormones are even involved in growth in puberty, such as the growth of your bones, for instance!

And much more...

Initial research has shown that red light therapy improves your overall health if you’ve got a common thyroid disease such as hypothyroidism and thyroiditis. In some cases, red light therapy can even help patients reduce or eliminate their need for levothyroxine - a commonplace thyroid medication (23; 24; 25).

Of course, the precise effects and outcomes in terms of hormonal balance and health affected by red light therapy are still being studied. What is exciting, however, is that there seems to be a strong connection between light exposure (in this case, through photobiomodulation) and overall hormonal health.

For that reason, I and others at Clearlight Infrared Cabins® keep a close eye on further research studies in this area. When new studies emerge, I’ll report on them to you!

Many people experience insufficient light exposure in their lives nowadays, which can contribute to thyroid problems in many cases. Hence, red light therapy is a perfect tool if you’re sitting indoors very frequently.

And, that’s not all yet.

6. Testosterone Increases - Especially In Men

Promising initial research has emerged on testosterone and red light therapy: initial research shows that testosterone therapy is an effective, natural tool for hormone health in men, including improving testosterone levels (26).

A randomized, placebo-controlled pilot study was conducted in 2016 by the University of Siena in Italy, in which 38 men with diagnosed low sexual desire were analyzed.

Here’s the study setup:

One group of men received red light therapy treatments in the morning, while the other group did not receive light therapy. The group of men treated with light therapy increased T levels significantly and attained higher sexual satisfaction in addition.

There was no increase in testosterone in the control group. The group with active light therapy experienced a huge increase from about 2.1 ng/ml to 3.6 ng/ml in only 2 weeks. To put that number in perspective, that’s a whopping 70% increase in testosterone!

Even though I’ve already alluded to this fact, let’s consider what makes testosterone so important:

Testosterone is a sex hormone that plays an important role in the body. In men, it is said to regulate the sex drive (libido), bone mass, fat distribution, the size of muscle cells, overall strength, and the production of red blood cells and sperm.

You might not know, however, that women also produce small amounts of testosterone in their ovaries and adrenal glands. Even for women, that testosterone is important.

Testosterone is also a building block for other hormones. In both sexes, for instance, a small amount of the circulating testosterone is converted into estradiol, a form of estrogen (27).

For female reproductive tissue and bone mass growth and maintenance , that “female” sex hormone estrogen and testosterone closely work together. Both hormones also influence behaviour.

Red light therapy is becoming increasingly interesting for women for that testosterone-optimizing effect. With regards to optimizing testosterone levels, the mode of action is somewhat different for women than men though:

One study shows that red light therapy elevated levels of “dehydroepiandrosterone” (DHEA). DHEA is essential for the synthesis of sex hormones and the production of progesterone, estrogen and testosterone. When women aren’t near their ovulation, they rely on the adrenal production of DHEA to maintain progesterone levels and prevent estrogen dominance (28).

In essence, higher DHEA helps you feel and perform better as a woman, even though you might not be in your “cycle high”!

Conclusion? Red light therapy can have an important positive influence on hormonal health in both men and women!

And there’s more:

7. Sleep, Melatonin Hormone And Circadian Rhythm Optimisation

Initial clinical research also shows that red light therapy can improve sleep quality and duration and help you produce more of your own melatonin (29).


Well, light plays an essential role in the sleep cycle. The body's internal clock (also called circadian rhythm) interprets light as a benchmark of waking and sleeping times.

Traditionally, sunlight, especially in the morning and evening, helps to tell your body what time it is. When the sun sets in the evening, for instance, we are already moving very much in the red colour of the light spectrum and your body gets a signal it’s time to wind down.

Remember that red light therapy contains ~50% red light. This reddish part of the spectrum is ideal for the evening because it has a low colour temperature - much lower than blue light and therefore very close to the natural sunset (30).

Research has shown that red light supports the sleep cycle and does not disturb it like bright blue light (31). It’s mainly the blue light, emitted from screens and regular light bulbs that wakes you up.

During the morning, moreover, red light therapy helps communicate to your brain that it’s daytime, which results in more melatonin secretion at night.

Sounds great right?

Let’s consider one last benefit:

8. Mental Health - Countering Seasonal Affective Disorder (SAD) And Depression

Light therapy also shows potential for improving the treatment of depression, SAD and mental health.

Seasonal depression affects millions of people worldwide. The lack of natural light every day is a factor that plays an important role here. Unfortunately, more and more people no longer spend large parts of their day in natural light, but mainly in front of computer monitors or other electronic devices.

Americans, for example, spend over 90% of their time indoors on average (32).

Natural light is of elementary importance, not only for vitamin D production but also for your internal clock, as described above (33).

To me, it’s a matter very close to my heart to motivate you to spend more time in nature and natural light. Sadly, for many working people it is not possible to spend much time in natural light during the week because of eight to ten-hour working days.

Fortunately, there’s a solution: red light therapy can provide an alternative source of light exposure. The health benefits of this therapy on a physical level have been described above.

And with regard to your mental condition promising scientific outcomes to exist as well:

For instance, red light therapy can directly contribute to mental health:

In 2018, leading researchers in the field of mental health conducted the pilot study "Elated-2" (34). During this study, transcranial near-infrared light therapy for people with severe depression symptoms was tested.

(“Trans-cranial” means the light diodes are placed on the skull and the light penetrates into your brain!)

The result?

After only 8 weeks of treatment, there was a medium to large-size positive effect size - which is similar to antidepressant medication without side effects! This groundbreaking study has fueled optimism for broader use of natural light treatments for people with depression.

And there’s more evidence for the thesis that red light therapy affects mental health:

Let’s consider a 2017 study involving 39 people with both traumatic brain injuries and mild to severe depression symptoms. The outcome? Once again, the light has a strong antidepressant effect (35)!

In fact, 36 of 39 study participants showed a clear positive reaction. In 32 of these people, the improvements were statistically significant and resulted in complete remission of clinical depression!

Crazy right?!!

The same study also showed that participants who received more frequent and overall more daylight treatments achieved better results than participants who received fewer treatments with light!

The story gets even better though:

Suicidal thoughts were also resolved in most patients: The researchers found that suicidal thoughts stopped in almost all patients except for two participants.

In follow-up studies, the researchers also concluded that patients remained in a reduced state of depression for up to 55 months after one single treatment.

Even the currently published data is extremely positive. These results also provide a good basis for further studies.

Summarising the above health issues, it is obvious that red light therapy has a wide range of health effects.

How Many Red Light Therapy Sessions Do You Need?

Optimising the results of your red light therapy sessions can come down to what you expect from your sessions.

Some users experience relief from their individual problems right after the first application. As a rule, however, lasting improvement requires continuous and correctly-applied exposure.

So, just like healthy eating is a habit you should follow for the rest of your life if you want to reap its benefits, the same is true for red light therapy.

Let’s dig deeper into the details:

After the near-infrared and red light device has been installed in the desired location and switched on, the following usage guidelines must be observed:


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How To Use Red Light Therapy Devices

This snippet explains the different ways to correctly use your Red Light Therapy devices.

1. The skin must be directly exposed to the light without barriers whenever possible.

You should thus avoid wearing everyday clothes, make-up and glasses. Thin underwear is allowed, although the best results are obtained when you are completely naked. Even contact lenses should be removed temporarily.

As long as you do not look directly at the LEDs for a long time, the near-infrared light has a positive effect on the area around the eyes, which is why experts believe that special protective glasses are not necessary.

2. You can carry out red light therapy in either a sitting or standing position.

The decisive factor is rather that you keep the prescribed distance to your device. In general, you can assume a distance of about 5-10 cm for optimal effect. For this, it is essential that you observe the specifications of your device.

If you stand away too far from the device, the power density will be lower and you won’t get optimal results. Simply put, the LEDs need to be close to the skin for optimal penetration into your body (The higher the dose on your skin, the deeper the penetration, so the better deeper tissues such as bones, blood vessels, muscles, and organs benefit).

3. For beginners we recommend a slow familiarization period at the beginning. Start with relaxed one- or two-minute treatments and increase to a usage time of 10 to 15 minutes within the next two to three weeks.

(If you’ve got a (chronic) health condition, this step is especially important.)

Also, if you’ve got any problem areas on your body, such as painful joints, you might want to treat these areas individually first, before progressing to full body treatments.

(If you’re using a big panel, you can cover up the areas you don’t want to treat yet with clothes to lower exposure)

Also, this familiarization period allows you to cut back on your sessions to an exposure level that has worked well in the past, if you ever begin to experience symptoms such as fatigue or increased joint pain.

4. Over time, building up to an average of one daily session is great. Most people use red light therapy 4-5 times a week, and experience the greatest benefit with that habit.

If you miss a day or have to do without your red light therapy due to important appointments, this is completely okay. However, you should not skip more than two or three days a week, otherwise your results will be inconsistent or sub-par.

With LED light therapy it is very similar to fitness training: you will experience the best results with consistent exposure over time.

5. My recommendation is to find the time of day that suits you and your everyday life. With red light therapy after getting up you can start the day with new energy or provide recovery directly after a training session in the afternoon.

Even at night, the treatment can be beneficial and provide an alternative to bright, artificial light. With nighttime exposure, it’s best to experiment though, as some people find red light therapy too stimulating just before bedtime.

Want even more recommendations for your sessions? Keep reading the section below - you’ll get access to a few more insights:

Recommendations from Clearlight Saunas Australia & New Zealand supplier of Jacuzzi® Saunas:

Need more info? Here are some Frequently Asked Questions (FAQs):

1. How Long, How Often Should I Use Red Light Therapy For Results?

Everyone is different, and accordingly it is difficult to give a concrete answer to this question. However, based on our analysis of the market and the studies I’ve cited before, the following is recommended:

Ideally 1x per day for 10-12 minutes at a distance of 5-10cm. If the distance is greater (e.g. 15 cm), the duration of use should be doubled, i.e. approximately 20 minutes. I recommend daily use, especially in the beginning, so that the photoreceptors in the skin get used to this form of light application.

More than once a day is not useful because the cells in the irradiated region cannot absorb more energy through this form of light. So, just like with exercise, more is not necessarily better.

2. In What Body Positions (e.g. Standing & Laying Down) Can I Use Clearlight’s Red Light Therapy?

Due to the product design, the ARL Mini and ARL Plus+ can be used very flexibly. A suspension is included in the scope of delivery, which makes it possible to hang the red light therapy on a hook or on the door. Furthermore, the product can be used standing or lying down.

Other possibilities could be to use it while meditating in the morning or while reading.

It is important that there is as much bare skin as possible so that the photoreceptors can absorb the light.

Lastly, only the Clearlight Red Light Version can be safely used within the Clearlight Infrared Cabins®. Red light therapy panels from other brands will almost certainly not withstand the heat buildup in our infrared cabins, leading to quick defects.

4. What is the level of EMF and ELF exposure when using Red Light Therapy?

Due to the very low power consumption, the exposure to electromagnetic frequencies is negligible. Unlike an infrared cabin, where many currents run around the body due to the presence of radiant heaters, magnetic fields, electric fields, and dirty electricity remain very close to the panel itself even though levels are already very low.

So, with red light therapy you have a much lower exposure to electromagnetic and electric fields. Due to the distance of approx. 5-10 cm, the exposure is basically negligible.

5. Do any Safety Concerns or Potential Side Effects Exist When Using Clearlight Red Light Therapy?

Clearlight's team of experts takes potential risks to our customers very seriously. Rest assured that negative side effects and consequences associated with infrared cabins and technologies are minimal and potential problems are eliminated thanks to extensive research in the field and high grand materials.

This guarantee of safety has been a key reason for Clearlight's founders to invest in light therapy from the very beginning.

In the worst case scenario, you can expect the usual side effects of a sauna session associated with the increased temperatures. Healing processes demand something from the body, which may result in symptoms such as headaches or exhaustion if used excessively.

In contrast to sunlight, however, red light therapy lacks wavelengths such as UV rays.

Additionally, our cabins protect you from the harmful effects of sunburn. However, the cabins cannot guarantee a tan due to that precise absence of UV light.

And because the infrared panels do not emit ultraviolet-B, which helps your skin create vitamin D, you therefore still have to obtain vitamin D from other sources.

Should you nevertheless experience any complaints or have specific questions regarding your near infrared red light therapy, do not hesitate to contact a health care professional and notify us immediately.

But just to fully inform you, let’s consider a more exhaustive list of potential side-effects:

While exceedingly rare, the following 5 side-effects can result from red light therapy in some very specific circumstances:

1. In some people, red light therapy can cause temporary fatigue. That fatigue is completely harmless and will subside after a good night's sleep.

The reason for that effect is a process called “hormesis”. Hormesis signifies the body’s adaptation to some temporary stressors. These temporary stressors not only include exercise and cold exposure but also light therapy, specifically the wavelengths used in red light therapy!

If you’ve got chronic fatigue, or another health condition, you might want to start more slowly with your sessions. If not, you might temporarily feel more fatigued, as if you’ve just completed an intense workout!

2. Using red light therapy over areas with carcinogenic tissues has not been fully scientifically understood yet.

And, because we don’t have certainty regarding red light therapy on cancer tissues yet, for now, I always recommend covering up such areas for now.

Again, I don’t imply there will be (potential) harm, I just want to be safe rather than sorry!

3. Red light therapy uses LEDs, which “flicker”. Flicker means that lights turn on and off many times a second, which causes issues in some people.

Even though most people’s eyes and brains are affected in minute ways due to flicker of light bulbs - such as fluorescent and LED bulbs - for some, side-effects are more prevalent.

If you can sit in a room with fluorescent and LED bulbs activated, then there’s no need to worry about this specific side-effect. Again, I’m just mentioning this potential side-effect to provide you with all information you could possibly need.

4. In many people, using red light therapy before bedtime reduces their melatonin levels and therefore sleep quality.

In others, however, using red light therapy before going to sleep helps them sleep more deeply.

Simply put, if red light therapy before bedtime reduces your sleep quality, then use it during the morning, afternoon, and perhaps even early evening.

5. Although mostly theoretical in nature, red light therapy could have slightly different effects than sunlight exposure over time.

Why? Red light therapy exposes your body to very specific wavelengths such as 660nm and 810nm, which maximally affect mitochondrial function. Sunlight, on the contrary, includes some wavelengths, such as 760nm, which inhibit mitochondrial energy production, on the contrary.

This side-effect has not been investigated by science and, due to the positive experience of millions of people, it’s extremely unlikely that a harmful effect will be found.

Again, as you can see, side-effects can theoretically occur, but are only present in a few exceedingly rare scenarios.

And that’s it - an overview of the history, physiological effects, and benefits of red light therapy. Let’s zoom out, consider the 30,000-foot view, and conclude:

Conclusion: Welcome To The Red Light Therapy Revolution!

Every now and then breakthroughs exist in science & technology that are truly beneficial to humanity. For instance, car travel not only transformed human transportation but society as a whole.

Red light therapy - and light therapy more broadly - might be understood in the same way in the decades to come. Since the Industrial Revolution, you, I, and our fellow human beings have progressively moved indoors. And by living indoors, however, we disconnected from the healing powers of the sun.

Fortunately, part of that light spectrum emitted by the sun, the red and infrared portion, is now accessible at your fingertips with red light therapy. I, Johannes Kettelhodt, am truly excited with these developments. Let me explain why:

A few decades ago, infrared saunas gave tens if not hundreds of millions of people an unmatched ability to detoxify, feel great, and relax. Clearlight improved upon that trend and supplies you with the highest-quality infrared saunas sold today.

Right now, in the same way, red light therapy provides you with faster recovery from sports, improved well-being, enhanced hormonal health, better skin quality, an uptick in cognition, and far more! And once again, Clearlight decides to contribute to this trend.

Join us in bringing your health to the next level! Why? 

Because you deserve the very best.

If you're interested in an infrared sauna cabin for home, click here to view our range of full-spectrum saunas, far-infrared saunas, and outdoor saunas.

Clearlight would like to remind users that this should not be taken as direct medical advice, and you should always consult a licensed health practitioner before making any significant changes to your lifestyle or existing pain treatment regimen.

Red Light Therapy Evidence

  1. R J Wurtman. The effects of light on the human body. Sci Am. 1975 Jul;233(1):69-77.
  2. Michael F Holick Biological
  3. Michael A Crawford, C Leigh Broadhurst, ... Walter F Schmidt. A quantum theory for the irreplaceable role of docosahexaenoic acid in neural cell signalling throughout evolution. Prostaglandins Leukot Essent Fatty Acids. 2013 Jan;88(1):5-13. doi: 10.1016/j.plefa.2012.08.005. Epub 2012 Nov 30.
  4. O-M H Richter, B Ludwig. Cytochrome c oxidase--structure, function, and physiology of a redox-driven molecular machine. Rev Physiol Biochem Pharmacol. 2003;147:47-74. doi: 10.1007/s10254-003-0006-0. Epub 2003 Feb 21.
  5. Vladimir Heiskanen, Michael R Hamblin. Photobiomodulation: lasers vs. light emitting diodes?. Photochem Photobiol Sci. 2018 Aug 8;17(8):1003-1017. doi: 10.1039/c8pp90049c.
  6. Hoon Chung, Tianhong Dai, ... Hamblin M. The Nuts and Bolts of Low-level Laser (Light) Therapy. Ann Biomed Eng. 2012 Feb; 40(2): 516–533.
  7. Vladimir Heiskanen, Photobiomodulation (PBM) / Low level laser therapy (LLLT) / red/NIR phototherapy studies - a comprehensive database, internet resource: https://docs.google.com/spreadsheets/d/1ZKl5Me4XwPj4YgJCBes3VSCJjiVO4XI0tIR0rbMBj08/edit#gid=0
  8. Michael Hamblin. Shining light on the head: Photobiomodulation for brain disorders. BBA Clin. 2016 Dec; 6: 113–124.
  9. D J Turnbull 1, A V Parisi, M G Kimlin. Vitamin D effective ultraviolet wavelengths due to scattering in shade. J Steroid Biochem Mol Biol. 2005 Sep;96(5):431-6.
  10. Juanita Mathews, Michael Levin. The body electric 2.0: recent advances in developmental bioelectricity for regenerative and synthetic bioengineering. Curr Opin Biotechnol. 2018 Aug;52:134-144. doi: 10.1016/j.copbio.2018.03.008. Epub 2018 Apr 21.
  11. Andrei P. Sommer. Mitochondrial cytochrome c oxidase is not the primary acceptor for near infrared light—it is mitochondrial bound water: the principles of low-level light therapy. Ann Transl Med. 2019 Mar; 7(Suppl 1): S13. 
  12. See Kruse J. Energy And Epigenetics 12, on the possibly deficient role of ATP to explain cellular energy dynamics. See: https://jackkruse.com/energy-epigenetics-12-battery-charged/?print=print
  13. Xinlong Wang, Fenghua Tian, ... Hanli Liub. Interplay between up-regulation of cytochrome-c-oxidase and hemoglobin oxygenation induced by near-infrared laser. Sci Rep. 2016; 6: 30540.
  14. Hamblin M. “Mechanisms and applications of the anti-inflammatory effects of photobiomodulation.” AIMS Biophys. 2017.
  15. Mutan Hamdi Aras, Mehmet Melih Omezli, Metin Güngörmüş. Does low-level laser therapy have an antianesthetic effect? A review. Photomed Laser Surg. 2010 Dec;28(6):719-22.
  16. Brassolatti P, de Andrade ALM, et al. Evaluation of the low-level laser therapy application parameters for skin burn treatment in experimental model: a systematic review. Lasers in Medical Science. 2018 July.
  17. Identical to previous footnote.
  18. Brosseau L, Welch V, et al. Low level laser therapy for osteoarthritis and rheumatoid arthritis: a meta-analysis. The Journal of Rheumatology. 2000 Aug.
  19. Wie Quelle 1.
  20. Wunsch A and Matuschka K. A Controlled Trial to Determine the Efficacy of Red and Near-Infrared Light Treatment in Patient Satisfaction, Reduction of Fine Lines, Wrinkles, Skin Roughness, and Intradermal Collagen Density Increase. Photomedicine and Laser Surgery. Feb 2014 and Avci P, Gupta A, et al. Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring. Seminars in Cutaneous Medicine and Surgery. Mar 2013.
  21. Vanin AA, et al. What is the best moment to apply phototherapy when associated to a strength training program? A randomized, double-blinded, placebo-controlled trial : Phototherapy in association to strength training. Lasers in Medical Science. 2016 Nov.
  22. Ferraresi C, de Brito Oliveira T, et al. Effects of low level laser therapy (808 nm) on physical strength training in humans. Lasers in Medical Science. 2011 May.
  23. Hofling DB, Chavantes MC, et al. Low-level laser in the treatment of patients with hypothyroidism induced by chronic autoimmune thyroiditis: a randomized, placebo-controlled clinical trial. Lasers in Surgery and Medicine. 2013 May.
  24. Hofling DB, Chavantes MC, et al. Assessment of the effects of low-level laser therapy on the thyroid vascularization of patients with autoimmune hypothyroidism by color Doppler ultrasound. ISRN Endocrinology. 2012.
  25. Hofling DB, Chavantes MC, et al. Low-level laser therapy in chronic autoimmune thyroiditis: a pilot study. Lasers in Surgery and Medicine. 2010 Aug.
  26. Fagiolini A et al. Lack of interest in sex successfully treated by exposure to bright light. European College of Neuropsychopharmacology. Sept 2016.
  27. Overview taken from online source: https://www.nih.gov/news-events/nih-research-matters/understanding-how-testosterone-affects-men#:~:text=Testosterone%20is%20a%20sex%20hormone,estradiol%2C%20a%20form%20of%20estrogen.
  28. Internal, unpublished study of the Joovv company and Bristlecone Medical.
  29. Morita T., Tokura H. “ Effects of lights of different color temperature on the nocturnal changes in core temperature and melatonin in humans” Journal of Physiological Anthropology. 1996, September.
  30. Lirong Z., Phyllis Z. “Circadian Rhythm Sleep Disorders” Neurologic Clinics. 2012, November.
  31. Moore, R. “Suprachiasmatic nucleus in sleep-wake regulation” Sleep Med. 2007, Dec.
  32. Klepeis NE, Nelson WC, Ott WR, et al. The National Human Activity Pattern Survey (NHAPS): a resource for assessing exposure to environmental pollutants. Journal of Exposure Analysis and Environmental Epidemiology. 2001 May.
  33. Christine Blume, Corrado Garbazza, Manuel Spitschan. Effects of light on human circadian rhythms, sleep and mood. Somnologie (Berl). 2019; 23(3): 147–156.
  34. Cassano P, Petrie SR, et al. Transcranial Photobiomodulation for the Treatment of Major Depressive Disorder. The ELATED-2 Pilot Trial. Photomedicine and Laser Surgery. 2018 October.
  35. Henderson TA, Morries LD. Multi-Watt Near-Infrared Phototherapy for the Treatment of Comorbid Depression: An Open-Label Single-Arm Study. Frontiers in Psychology. 2017 September.
  36. Mark P Mattson. Hormesis defined. Ageing Res Rev . 2008 Jan;7(1):1-7.
  37. R Küller, T Laike. The impact of flicker from fluorescent lighting on well-being, performance and physiological arousal. Ergonomics. 1998 Apr;41(4):433-47. doi: 10.1080/001401398186928.

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