Infrared Light Therapy Explained – Wavelengths, Depth and Sessions

You have already met infrared light today. It was in the warmth radiating off the footpath at 6pm, in the remote you point at the telly, and in that moody red glow your gym mate keeps posting on their story. Same family of light, very different jobs.

Somewhere in the middle sits infrared light therapy — decades of research with an unfortunate amount of internet nonsense stacked on top. Depending on where you land online, it either melts fat while you nap or does nothing at all.

The truth comes down to three things: wavelength, depth and dose. Get those right and light becomes a legitimate skin and recovery tool. Get them wrong and you have paid for a warm nap under a fancy lamp.

The 30-second version

• Infrared light is invisible light sitting just past red on the spectrum.
• Red light (630–660 nm) works on the skin. Near infrared (800–900 nm) reaches deeper tissue.
• It works by signalling to your mitochondria, not by heating you.
• Sessions are short (10–20 minutes) and repeated, not one-and-done.
• More is not better. There is a sweet spot, and you can overshoot it.

What Infrared Light Therapy Is (and What It Isn’t)

Visible light runs from violet at roughly 400 nanometres to deep red at about 700 nm. Past that, your eyes give up but the light keeps going — that invisible stretch is infrared.

Clinics use a slice of it — mostly near infrared light therapy between 800 and 900 nm — delivered through LED panels or low-level lasers. The research term is photobiomodulation, which sounds like a Marvel plot device but means light changing how cells behave.

Three things it is not:

• Not laser resurfacing. No wounding, no downtime, no peeling.
• Not UV. No tanning, no DNA damage, no burn risk from the light itself.
• Not a sauna. Far infrared saunas warm you. LED-based infrared red light therapy works at intensities where heat is a side note, not the mechanism.

That last distinction trips up almost everyone.

How Does Infrared Light Therapy Work?

Light only does something when a molecule absorbs it. That absorbing molecule is called a chromophore, and the star of this story lives in your mitochondria: an enzyme called cytochrome c oxidase.

Cytochrome c oxidase happens to absorb red and near infrared wavelengths beautifully. When it does, a few things follow:

1. Nitric oxide gets nudged loose. It competes with oxygen for a spot on the enzyme, particularly in stressed cells, so shifting it frees the enzyme up.
2. ATP production lifts. More cellular energy, more capacity to repair and rebuild.
3. A brief signalling flicker happens. A small, controlled burst of reactive oxygen species acts as a message rather than damage, switching on repair-related genes.
4. Fibroblasts get busy. These are your collagen and elastin factories, which is where the skin results come from.
5. Local circulation improves. More blood flow means more oxygen and nutrients delivered where they are needed.

The useful mental model: the light is a message, not a heat gun. Nothing is being burned, broken or blasted. Cells are handed better working conditions and asked politely to do their jobs.

Which explains the biggest misconception in this space — that if a little light helps, a lot must help more. It does not.

The Wavelength Cheat Sheet

Wavelength determines how deep the light travels, what absorbs it, and what it is good for. This is the part most product pages skip.

Notice the pattern break at the bottom. Far infrared saunas feel deep because heat spreads through your bloodstream — but the light itself stops at the skin. Marketing blurs that line. Physics does not.

The workhorse zone for clinical devices is 600 to 1,200 nm, the optical window. Below it, melanin and haemoglobin absorb light almost immediately. Above it, water soaks it up. In between, light gets its best run at living tissue.

How Deep Does It Go?

Here is where the claims get colourful. You will see “penetrates 5 centimetres” plastered on device pages with the confidence of a weather presenter.

The honest version: light scatters and weakens exponentially with every millimetre it travels. Near infrared at 850 nm reaches deeper than red at 660 nm, and both reach deeper than blue — but the intensity arriving at 3 cm is a small fraction of what left the panel.

What that means in practice:

• Skin concerns — tone, texture, congestion, fine lines — sit within reach of red wavelengths.
• Deeper targets — muscle soreness, joints, connective tissue — need near infrared and closer, more consistent exposure.
• Skin tone matters. More melanin absorbs more light at the surface, one reason near infrared suits a wider range of skin types.

The number to care about is not “how deep” but how much energy arrives at the target. That is measured in joules per square centimetre (J/cm²), and it is a straightforward sum:

Irradiance (mW/cm²) × time (seconds) ÷ 1,000 = dose (J/cm²) A panel at 40 mW/cm² for 10 minutes delivers roughly 24 J/cm².

Distance matters enormously — move twice as far from the panel and intensity drops sharply. It is why a supervised clinic session and a random gadget from an online marketplace produce very different outcomes despite looking similar in photos.

Infrared vs Red Light Therapy: The Difference

The most searched question in this category is what the difference between red light therapy and infrared is — and the framing is the problem. They are not rivals. They are different tools sorted by depth.

So, what is better — red light therapy or infrared? Whichever one reaches your concern. Surface complaint, red. Deep complaint, near infrared. Most quality clinical panels run both together, because most people have a bit of each.

Infrared blue light therapy combinations show up frequently in acne protocols for the same reason: blue handles surface bacteria, red and near infrared calm the inflammation underneath. Our LED light therapy sessions use multi-wavelength protocols selected for your concern rather than a single fixed setting.

Infrared Light Therapy Benefits, Sorted by What You Want

For your face and skin

The infrared light therapy for face benefits most commonly reported in clinical settings:

• Support for collagen and elastin production over a course of sessions
• Calmer-looking redness and reactive skin
• Smoother texture and a more even-looking tone
• Faster settling of post-treatment redness
• Support for acne-prone skin when paired with blue wavelengths

Results build. Fibroblasts do not sprint — collagen turnover takes weeks, so meaningful skin change typically shows up around the 8 to 12 week mark, not after session two. This is also why LED pairs so well with other treatments: a session after skin needling, a chemical peel or IPL rejuvenation supports the recovery phase rather than competing with it.

For pain and inflammation

Infrared light therapy for pain relief is the most established use outside aesthetics, and where near infrared earns its keep. The proposed mechanism combines improved local circulation, modulated inflammatory signalling and better cellular energy in tissue under strain.

Infrared light therapy for inflammation works on the same principle — calming an overactive response, not switching it off. Inflammation is part of healing; the aim is proportion.

Full body sessions

Full body infrared light therapy uses large panels or beds to treat everything at once, usually 10 to 20 minutes. The appeal is coverage and convenience; the trade-off is that a whole-body dose is rarely optimised for any single concern. Targeted sessions give you more control over intensity and distance.

Does Infrared Light Therapy Work for Weight Loss?

The short, unglamorous answer: not as a weight loss treatment.

Certain red wavelengths around 635–680 nm have been studied for temporary circumference reduction, with the working theory that light briefly increases fat cell membrane permeability, allowing some lipid content to move out. Reported effects are modest, temporary without ongoing lifestyle support, and measured in centimetres rather than kilograms.

What light does not do: destroy fat cells, create a calorie deficit, or replace nutrition, movement and sleep.

Infrared light therapy for fat loss is best understood as a possible support act, not a headliner. If body contouring is your goal, treatments designed for it — like ultrasound fat cavitation or RF skin tightening — do that job far more directly. Explore the full body treatment range to see what suits your goals.

Anyone promising fat loss from a light panel alone is selling you the panel, not the outcome.

Sessions: How Long, How Often, How Many

Dose is the whole ballgame, and this is where most at-home routines fall apart — not from lack of effort, but from too much of it.

Photobiomodulation follows a biphasic dose response. Too little does nothing, the right amount produces benefit, and too much tips into diminishing returns. It behaves more like a medication than sunlight.

Two rules worth taping to the fridge:

1. Consistency beats intensity. Three sensible sessions a week outperform one marathon session.
2. Frequency beats duration. Doubling session length does not double results. It doubles your boredom.

How often can you do infrared light therapy? For most goals, two to five sessions weekly during an active course, then weekly maintenance. Daily sessions appear in some recovery protocols, but they should be shorter, not longer.

Can You Overdo Infrared Light Therapy?

Yes — and it is the most common mistake made by enthusiastic beginners.

Overshooting the dose rarely causes dramatic harm, but it can stall progress and leave skin looking flat or slightly irritated. Sitting under a panel for 45 minutes because 15 felt nice is the equivalent of taking six paracetamol for a headache.

Beyond dose, a few considerations:

• Eyes. Near infrared is invisible, so your blink reflex offers no protection. Wear the eyewear provided.
• Photosensitising medications. Isotretinoin, certain antibiotics, some diuretics and St John’s Wort can all increase light sensitivity. Flag anything you take.
• Melasma and heat-reactive pigmentation. Melasma can be aggravated by heat. Wavelength selection and device intensity matter here — this is a conversation to have before booking, not after. Our pigmentation treatment and melasma treatment pages cover the alternatives.
• Pregnancy, active cancer, light-triggered epilepsy. Always disclose — suitability is assessed individually.
• Cheap devices. Many home units are underpowered, or built without the wavelength precision they advertise. Check irradiance and wavelength, not just star ratings.

When to Use Infrared Light Therapy

The red infrared light therapy benefits stack up best when the treatment is placed thoughtfully inside a broader plan. Sensible entry points:

• After a resurfacing or needling treatment, to support the recovery window
• During an active acne program, alongside your acne treatment plan
• In the lead-up to an event, as a course rather than a last-minute rescue
• Through winter, when skin turnover slows and everything looks a touch dull
• As maintenance, once you have the result you wanted
• Alongside good skincare — light supports your cells, but it will not out-work a poor routine. Our professional skincare range covers the at-home half.

Times to hold off: broken or infected skin, active sunburn, or an undiagnosed skin concern.

The Bottom Line

Infrared light therapy is not magic and it is not a scam. It is a dose-dependent tool with a clear mechanism, real limitations and a specific job — helping your cells do their own repair work more efficiently.

Get the wavelength right for your concern, respect the depth it can reach, and show up consistently. That combination is where the results live.

If you are not sure whether infrared light therapy is the right fit — or whether something else in the facial treatment range suits you better — a consultation sorts that out. We will look at your skin, explain what is suitable, and tell you honestly if light therapy is not the answer.

Book a consultation at our Tarneit clinic, or get in touch — we are happy to answer questions before you book anything.

This article is general information only and is not a substitute for personalised advice. Individual results vary. A consultation is recommended to determine suitability.