37 Fascinating Facts about Infrared Radiation (IR Rays)

Infrared radiation, also known as infrared rays – the invisible rays of natural sunlight –  has literally thousands of applications, most of them you haven’t heard about, and some of them may blow your socks off.

While you probably heard about infrared saunas, infrared cameras, and infrared heating pads, you may be surprised to learn the countless IR rays applications in sports, medicine, surveillance, communication, missile guidance, weather forecasting, and even clothing.

In this post, you’ll find more than 30 fascinating facts about infrared rays, and how you too can use infrared therapy for your health and well being.


Here we go.

This post contains affiliate links. Click here to read my affiliate policy.

What is Infrared Radiation?

This may sound weird to you, but most of the light around you is invisible to the human eye.

Though your eye is an incredible piece of engineering, it is only able to see light at certain wavelengths – and is blind to much more light than it can see.

Light is actually a form of energy that travels in waves, and we can place these waves on the electromagnetic spectrum.

Infrared radiation, or simply infrared or IR, is electromagnetic radiation with longer wavelengths than those of visible light and is therefore invisible.

It extends from the nominal red edge of the visible spectrum at 700 nanometers (frequency 430 THz) to 1000000 nm (300 GHz).

Infrared light has a range of wavelengths, just like visible light has wavelengths that range from red light to violet.

The longer, far infrared waves are thermal – we experience them every day in the form of heat.

The heat (thermal energy) we feel from sunlight, a radiator or fire is infrared, and the wavelengths are about the size of a pinhead.

Near-infrared light is closest in wavelengths to visible light and is actually not hot at all. NIR is the size of cells, or are microscopic.

(you’ll find it in your remote controls at home).

And now:

37 Amazing Facts about Infrared Radiation

1. Almost half of the energy arriving at the Earth from the sun comes as infrared light.

2. Anything which has a temperature puts out heat or infrared light.

3. Infra-Red waves are also given off by stars, galaxies, lamps, flames, and anything else that’s warm – including you.

infrared rays
Earth’s energy budget, with incoming and outgoing radiation.
Source: NASA

4. One of the advantages of IR observation is that it can detect objects that are too cool to emit visible light. This has led to the discovery of previously unknown objects such as comets, asteroids, and wispy interstellar dust clouds.

5. Everything has some heat and puts out infrared light. Even things that we think of as being very cold, like an ice cube – put out some heat.

6. Infrared light can travel through thick smoke, dust or fog, and even some materials.

7. In firefighting, infrared cameras are being used to locate people or animals in heavy spots and to detect hot spots in forest fires.

8. Humans, at normal body temperature, radiate most strongly in the infrared at a wavelength of about 10 microns. (A micron is a term commonly used in astronomy for a micrometer or one-millionth of a meter.)

Infrared imaging of a man with a plastic bag over his hand.
Source: NASA

9‘Palm Healing‘, an ancient tradition in China, has used the healing properties of far infrared rays for 3,000 years. These natural healers emit energy and the heat radiating from their hands to heal, much the same as Reiki healers do. Yogis in India also employ palm healing and recommend it especially for relieving eye strain.

10. The human skin can “see” infrared light (it is reacting to the infrared photons), not just the heated air.

Your entire skin surface is an infrared eyeball.

On a sunny day, step outside, close your eyes, and you will discover that it’s very easy to find where the sun is in the sky without seeing any visible light at all, by using the palm of your hand as your “eye”.

11. In the winter, we feel comfortable with a sweater on when the room air temperature is 70F. In the summer, we feel more comfortable wearing a t-shirt in the same room air temperature of 70F.

The explanation is that even though the air temperature is the same, the walls and ceiling radiate FIR waves from the outside sunshine during the summer, which thereby causes our bodies to be warmer.

12. Couples that sleep together act as transmitters and receivers of FIR waves to each other. If you sleep alone, you act as a transmitter of FIR waves, but you receive none in return.

hugs emit infrared radiationWhen people sit together and talk, they are sending out and receiving vibrations of FIR from each other. Cuddling your pet will also share FIR heat between you.

13. Humans may not be able to see infrared light, but snakes in the pit viper family, like rattlesnakes, have sensory “pits”, which are used to image infrared light

This allows the snake to detect warm-blooded animals, even in dark burrows. Snakes with 2 sensory pits are even thought to have some depth perception in the infrared.

14. Fish use NIR to capture prey and for swimming orientation. NIR sensation in fish may be relevant under poor lighting conditions during twilight and in turbid surface waters.

15. Infrared (IR) radiation is just as important to the Earth’s weather and climate as sunlight is. This is because, for all of the sunlight that the Earth absorbs, an equal amount of IR radiation must travel from the Earth back to outer space.

Otherwise, there would be global warming or global cooling.

16. The reason why the air cools so quickly on a clear, dry evening is that the lack of humidity and clouds allows large amounts of IR radiation to escape rapidly to outer space as it is emitted upward by the ground and other surfaces.

17.  Satellites like GOES 6 and Landsat 7 look at the Earth. Special sensors, like those aboard the Landsat 7 satellite, record data about the amount of infrared light reflected or emitted from the Earth’s surface.

Satellite Landsat 7
Source: NASA

Other satellites, like the Infrared Astronomy Satellite (IRAS) look up into space and measure the infrared light coming from things like large clouds of dust and gas, stars, and galaxies!

18. Infrared is used in night-vision goggles and equipment when there is insufficient visible light to see.

Night vision devices convert ambient light photons into electrons that are then amplified by a chemical and electrical process and then converted back into the visible light, increasing in-the-dark visibility without actually using a visible light source.

19. Infrared ovens were the first ovens.

In earlier days, infrared ovens were the most widely used electronic gadgets to heat food. They were made of an infrared producing burner that excited molecules and increased their temperature.

The hot air however dried the food up and these ovens were thus replaced by the present microwave ovens.

Modern Tabletop infrared oven.

20. Infrared tracking, also known as infrared homing, refers to a passive missile guidance system, which uses the emission from a target of electromagnetic radiation in the infrared part of the spectrum to track it

21. Weather satellites equipped with scanning radiometers produce thermal or infrared images, which can then enable a trained analyst to determine cloud heights and types, to calculate land and surface water temperatures, and to locate ocean surface features.

22. Infrared is the most common way for remote controls to command appliances

infrared remote control

23. The Japanese have extensively researched Far Infrared Technology for use in the fields of healing, preservation, cooking, drying, and heating. Over 150 significant patents were granted between 1977-1987.

Here are a few popular infrared products available in Japan today (click the links to find them in the U.S.A)

  • FIR sleeping pads and heaters – instant warmth even though air temperature remains cool (Infrared sauna too!)
  • FIR plastic plate to keep fish and vegetables fresher and longer in your refrigerator
  • FIR ceramic paper and ceramics.
  • FIR fabrics – socks, infrared gloves, jackets, car seats (FIR fabric keeps the body warm in a cold environment whilst providing passive FIR health benefits)
  • FIR hair dryer – cooler and faster, reduces damaged hair, now popular worldwide.
infrared hair dryer
Infrared hair dryer. Prevents hair damage and eliminates frizz – view on Amazon

24. Infrared reflectography (as called by art conservators), can be applied to paintings to reveal underlying layers in a completely non-destructive manner, and specifically the under-drawing or outline drawn by the artist as a guide.

This is very useful information in deciding whether a painting is a prime version by the original artist or a copy and whether it has been altered by over-enthusiastic restoration work

25. The boron-silicate mineral, tourmaline (known as a gemstone in its crystalline form) when milled into fine powders emits far infrared rays (which is why it is commonly used in the best infrared heating pads and mats)

Infrared Rays Incredible Health Uses

infrared health benefits
See the best 2-person infrared saunas on the market

Since ancient times, people have known that exposure to sunshine can maintain and boost health.


These days sunbathing is limited since sunlight contains potentially harmful UV rays, which can burn the skin.

Far infrared radiant heat provides all the healthy benefits of natural sunlight without any of the dangerous effects of solar radiation.

(Plus, with IR rays technology you can control temperature and you are not limited to sunny days).

The pain relieving and anti-aging benefits of IR therapy have been known for over 40 years – but here are some little-known facts about IR radiation health benefits and uses, worldwide:

1. In Japan, there is an infrared society, composed of medical doctors and physical therapists dedicated to further Far Infrared heat research.

Their findings support the outstanding health benefits of Far Infrared thermal therapy as a natural method of healing.

2. Far Infrared strengthens the cardiovascular system by causing heart rate and cardiac output to increase, and diastolic blood pressure to decrease.

Research by NASA in the early 1980s led to the conclusion that far infrared stimulation of cardiovascular function would be the ideal way to maintain cardiovascular conditioning in American astronauts during long space flights.

3. SCIENTIFIC FACT: Far Infrared heat above 40C 107.6 degrees F) weakens and kills cancer cells:

Far Infrared thermal therapy – commonly known as Hyperthermia – is used extensively in Asia and Europe – especially Japan and Germany – but is only fairly recently in comparison, being researched and utilized within the USA.\


It is now acknowledged and attested to by the American Cancer Society and the National Cancer Institute on their respective websites.

infrared therapy for cancer
Source: Dr. Sircus

4. Infrared saunas are frequently used in Japan and Korea (where the practice is called “Waon therapy) for cardiovascular conditions and diseases, particularly chronic heart failure and peripheral arterial disease.

5. Discs and garments manufactured of FIR-emitting ceramic material have been applied to the human body in research studies.

For instance, a blanket containing discs has been reported to improve sleep quality and single discs were applied to the breasts of women who encountered difficulty producing sufficient breast milk during lactation.

Gloves have been made out of FIR emitting fabrics and there have been reports that these gloves can be used to treat arthritis of the hands and Raynaud’s syndrome.

6. Sunburn – According to Clayton’s Electrotherapy, 9th Edition, far-infrared radiation is the only antidote to excessive ultraviolet radiation.

7. 30 minutes in an infrared sauna burns hundreds of calories and makes you sweat off 500 grams in one session.

As reported in the Journal of American Medical Association:

A moderately conditioned person can easily sweat off 500 grams in a sauna, consuming nearly 300 kcal, which is equivalent to running 2-3 miles. A heat-conditioned person can easily sweat off 600-800 kcal with no adverse effects. While the weight of the water loss can be regained by drinking water, the calories consumed will not be.

infrared home sauna
Infrared sauna for home use – see the 2 best home infrared saunas

8. In a new study published in the journal, Neuropsychiatric Disease, and Treatment, Near Infrared rays are being hailed as a “medical breakthrough” in the treatment of traumatic brain injury (TBI), which plagues millions of athletes, military veterans, and first-responder professionals.

9. Compared to steam saunas or conventional heat, far infrared is thought to be seven times more effective at detoxifying heavy metals (such as mercury and aluminum), cholesterol, alcohol, nicotine, ammonia, sulfuric acid, and other environmental toxins.

10. Sitting in a far infrared sauna in the early stages of a cold or flu has been known to stop the disease before symptoms occur.

11. FIR therapy in both Japan and China has proven to be outstanding for asthma, bronchitis, colds, flu, sinusitis and congestion as it clears inflammation, swelling, and mucous clogged passages, as testified to in Dr. Kyuo’s book –  “The Scientific Basis and Therapeutic Benefits of Far Infrared Ray Therapy”

12. Update: Infrared rays are being used by medical professionals to detect hard-to-find veins when doing venipuncture and cannulation.


You’ve just learned 37 incredible facts about the infrared wavelength, and the hundreds of applications it has in medicine, sports, weather forecasting, thermal imaging, communications and even saving lives during a fire.

We here at Infrared-Light-Therapy.com are fascinated with infrared light therapy, and we hope you stick around and read some more about the many ways you can use it to improve your health and well-being – naturally.

Check out the most frequently asked questions about infrared therapy.

If you have any questions or comments, we’d love to know!

To your health and happiness,




Treatments for traumatic brain injury with emphasis on transcranial near-infrared laser phototherapy








Meital James
Founder and CEO of 4 healthy living blogs, has a background in Naturopathic medicine, research, journalism, and nutrition. Her blogs are the culmination of her thousands of hours of research and experience and all the posts are verified by scientific findings.


9 thoughts on “37 Fascinating Facts about Infrared Radiation (IR Rays)”

  1. I have been suffering from idiopathic neuropathy of the legs and feet for some ten years. Medication initially had some slight effect. I have been using a near infrared lamp regularly and have derived some benefit. I understand that far infrared irradiation is the only other method that might be beneficial. I live in a third world country where sophisticated treatment equipment is not available and must be either imported or obtained through Amazon or Ebay etc. I have been able to find out the construction of self energized FIR devices. These use very costly precious stones as secondary emitters and are way beyond my purchasing power. From published data I find many common materials have very high emissivities around 0. 96 to 0.98 in the range 7microns to 14 microns , so why have these materials not been used in FIR devices?
    I would sincerely appreciate any help you might be able to offer me towards the building of a self energized or electrically powered foot box using suitable common materials or give me some references or links to sources for the information I so desperately need. Thanking you and hoping that you will help.

  2. I want to try infrared led light on my skin for my wrinkles and elasticity on my face. The devices for sale are expensive. Where could I find a less expensive device. What about a red led bulb? What do you think?

  3. Hi. I have read somewhere that jade is the best material to emit infrared light through. Others say ameythist, now I hear tourmaline? Can you give me some insight please?

    • These are all theories, there are no scientific studies on whether jade emits infrared rays better than Amethyst to Tourmaline. Either one would be good. There are some pads that combine 2 or more types of semi-precious stones. For example, the Biomat has both tourmaline and amethyst.

    • I don’t think so…an infrared detector is a detector that reacts to infrared (IR) radiation. Since metal doesn’t emit any heat (unless it is heated), I don’t think it can detect it.

  4. Dear colleague James,

    Thanks, it was a really perfect academic assumption of IR’s all benefice. Thus, please may you share your experiences with ever anybody has tested Infrared eco-safe killing of stink bug /the brown marmorated stink bug/ in organic vineyard & the hazel (Corylus) plantation

    with the best wishes in coming New 2018 Year!


Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.