When an infrared sauna is described as near, far, or full spectrum, the label tells you what the manufacturer is claiming. It does not, by itself, tell you how the system is built or what wavelengths its emitters actually produce.
Instead of asking only, "Which type of infrared is best?", ask:
What wavelengths does this sauna produce, how does it produce them, and does the manufacturer provide enough technical information to support the claim?
That distinction matters because terms such as full spectrum, carbon, ceramic, and hybrid can describe very different heater systems.
This guide explains what near, mid, and far infrared mean, what "full spectrum" should prompt you to investigate, and how to compare infrared saunas without relying on marketing terminology alone.
Near, Mid, and Far Infrared: The Short Answer
Infrared is electromagnetic radiation just beyond visible red light. The International Commission on Illumination, or CIE, divides infrared into three technical categories:
- IR-A: 780 nanometers to 1.4 micrometers
- IR-B: 1.4 to 3 micrometers
- IR-C: 3 micrometers to 1 millimeter1
You will often see near, mid, and far infrared used in place of those categories when shopping for saunas. However, those terms are not governed by one universal set of boundaries. CIE specifically notes that the borders between near, middle, and far infrared vary according to application.1
For buyers, the label is not the specification.
A sauna advertised as near infrared, far infrared, or full spectrum should be evaluated based on the wavelengths it claims to produce and the heater or emitter technology responsible for producing them.
What Are Near, Mid, and Far Infrared?
Here is what each term means when you encounter it while comparing infrared saunas.
Near infrared
Near infrared sits closest to visible red light.
If a sauna advertises near-infrared capability, look for the actual wavelength information in the technical specifications rather than assuming the term itself tells you what the system produces.
Mid infrared
Mid infrared sits between the shorter near-infrared wavelengths and longer far-infrared wavelengths.
The boundaries between near, middle, and far infrared can vary by application.1 Compare the stated wavelength range rather than assuming one universal cutoff.
Rather than asking whether a sauna simply includes "mid infrared," look for the wavelengths claimed by the manufacturer and the component that produces them.
Far infrared
Far infrared refers to longer infrared wavelengths and is widely associated with infrared heating applications.
One misconception deserves particular attention here.
You may encounter claims that near infrared heats only the surface, mid infrared penetrates farther, and far infrared penetrates deepest into the body. That is not a reliable way to understand infrared.
According to the International Commission on Non-Ionizing Radiation Protection, IR-A reaches farther into skin tissue than IR-C, which is taken up mainly near the surface.2
In other words, longer wavelength does not automatically mean deeper penetration.
For a sauna buyer, penetration depth should not be treated as a quality score. A product is not inherently better because its marketing says one wavelength "goes deeper."
How Does an Infrared Sauna Work?
Infrared heaters transfer a significant portion of their energy through radiation. Instead of depending only on heating the cabin air first, infrared energy can transfer directly to exposed surfaces.3
The cabin still becomes warm. It is therefore misleading to say that an infrared sauna heats only your body and does not heat the air.
One practical difference is that infrared saunas commonly operate at lower air temperatures than conventional hot-air saunas. Cleveland Clinic gives typical ranges of approximately 110°F to 135°F for infrared saunas and 150°F to 195°F for traditional saunas.5
Those are typical ranges rather than requirements for every product. Actual operating temperatures depend on the sauna and how it is designed to be used.
For buyers, the larger point is that an infrared sauna creates a different heating environment from a conventional sauna. That makes the design and placement of the infrared emitters important.
What Does "Full Spectrum" Mean in an Infrared Sauna?
"Full spectrum" is one of the most common terms you will encounter when shopping for an infrared sauna.
It can also be one of the least informative unless the manufacturer explains what is behind the claim.
CIE defines IR-A, IR-B, and IR-C and notes that near, middle, and far infrared boundaries can vary by application. Its infrared vocabulary does not define the commercial phrase "full spectrum infrared sauna."1
Treat "full spectrum" as a claim to investigate, not as a complete technical specification.
Check how the sauna produces the claimed spectrum
A useful way to test a spectrum claim is to trace it through four things:
- Which infrared wavelengths or ranges the sauna claims to produce.
- Which heater or emitter produces those wavelengths.
- Where those emitters are positioned in the cabin.
- Whether the manufacturer provides technical documentation supporting the claim.
Different products can use very different approaches.
For example, a specification sheet for the Finnmark Designs Hybrid 2.0 identifies separate near-infrared LED technology, mid/far infrared emitters, and far-infrared flat panels.4
That is one product architecture. It should not be assumed to represent every full-spectrum sauna.
Other manufacturers may use different configurations. When a sauna is marketed as full spectrum, verify which components produce the claimed wavelength ranges.
Does a full-spectrum sauna need three separate heaters?
The evidence does not support using "three separate heaters" as a universal test. Infrared-heater designs can be classified across different wavelength regions, and their characteristics depend on variables such as emitter temperature, material, size, and shape.3
Heater material and infrared category are therefore not a simple one-to-one relationship.
A more useful buying question is:
How does this particular manufacturer produce each part of the spectrum it claims?
That keeps the focus on the actual product rather than on a rule that may not apply to every heater design.
Is Near Infrared the Same as Red Light?
Visible red light and near infrared are adjacent but distinct wavelength regions.1,6
If a sauna describes a separate red-light or near-infrared feature, check the wavelengths stated for that component rather than relying on the feature name alone.
Keep the wavelength specification separate from any therapeutic claim.
Photobiomodulation findings can vary with wavelength, intensity, and route of exposure.6 A study involving a particular light-therapy device does not automatically establish the same effect for a sauna simply because both use red or infrared wavelengths.
For that reason, we recommend evaluating the sauna's heating and wavelength specifications separately from health claims attached to red-light or near-infrared therapy.
Ceramic vs. Carbon vs. Hybrid Infrared Heaters
Infrared sauna specifications also use terms such as carbon, ceramic, and hybrid. These describe aspects of heater or emitter construction, not wavelength categories.
Carbon infrared heaters
Carbon is one material used in infrared emitters, but "carbon" is not itself a wavelength category. A UK government review of infrared heating lists carbon-fibre emitters across more than one infrared category.3
Do not assume that every carbon heater is automatically far infrared or that the word "carbon" predicts how a sauna will feel.
Ceramic infrared heaters
Ceramic is also used as an infrared-emitter material. As with carbon, the material name alone does not establish the complete spectral output of a heater.
Emitter surface temperature, material, size, shape, and location are among the variables used to characterize infrared-heater designs.3
Claims that ceramic heaters are always faster, hotter, more penetrating, or better than carbon heaters should be checked against documentation for the specific model.
Hybrid infrared heaters
When a manufacturer uses the word "hybrid," check the definition for that specific model. The specification should identify which heater or emitter technologies are being combined.
What Carbon, Ceramic, Full Spectrum, and Hybrid Labels Tell You
| Label | What it can tell you | What it does not tell you by itself |
|---|---|---|
| Near, mid, or far infrared | The general infrared region being claimed | Exact wavelength output or overall sauna quality |
| Full spectrum | The manufacturer claims output across multiple infrared regions | How those wavelengths are produced |
| Carbon | Something about emitter construction | A guaranteed wavelength band |
| Ceramic | Something about emitter construction | A guaranteed wavelength band or performance level |
| Hybrid | It is a model-specific manufacturer term that needs further definition | Which technologies are included or whether the system is better |
This is why comparing infrared saunas by one headline specification can be misleading.
A heater material, spectrum label, or marketing term is only one part of the system.
How to Compare Infrared Saunas Before You Buy
1. Look for stated wavelengths
If a sauna claims near, mid, far, or full-spectrum infrared, look for actual wavelength information.
Look for a stated wavelength or wavelength range rather than only a category label such as "near infrared" or "full spectrum."
2. Identify the emitter technology
Determine whether the sauna uses carbon panels, ceramic elements, LEDs, another emitter design, or a combination.
Remember that the material alone does not determine the wavelength category.3
3. Look at where the heaters are located
Emitter location is one of the design variables in an infrared-heating system.3
When comparing saunas, check the product layout to see where the emitters are positioned relative to the seating area.
A specification that explains where different emitters are located gives you more useful information than a spectrum label by itself.
4. Separate sauna heating from light-therapy features
If a model includes both infrared heaters and a red or near-infrared light panel, evaluate those components separately.
Ask:
- Which component heats the sauna?
- Which component produces near infrared?
- Which component produces visible red light?
- What wavelengths are stated for each?
This prevents two distinct technologies from being blended into one vague wellness claim.
5. Do not use penetration depth as a ranking system
Claims that one infrared range is better simply because it "penetrates deeper" oversimplify how infrared interacts with tissue.2
Instead, compare the sauna as an entire heating system.
Which Type of Infrared Sauna Should You Choose?
There is no single near, mid, far, carbon, ceramic, or hybrid configuration that is automatically right for every buyer.
Compare the wavelengths a model claims, how those wavelengths are produced, and the documentation provided for that sauna. Then consider the complete product, including cabin size, usable space, and emitter arrangement.
We recommend using the spectrum label as a starting point, then verifying the wavelengths, emitter technology, and product documentation behind the claim.
You can apply that framework while comparing models in the My Sauna Plus infrared sauna collection. If you would rather talk through a specific model's specification sheet with someone first, you can also schedule a free expert consultation.
Sources
- CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition, "infrared radiation." cie.co.at/eilvterm/17-21-004. Defines infrared and the IR-A, IR-B, and IR-C ranges and notes that near, middle, and far infrared boundaries can vary by application.
- Infrared Radiation. International Commission on Non-Ionizing Radiation Protection. icnirp.org/en/frequencies/radio. Relevant sections: "Wavelength range and sources" and "IR effects on the body and health implications." Confirms IR-A reaches farther into skin tissue than IR-C.
- Infrared Heating: Investigations from Literature and User Experience Tests. UK Department for Energy Security and Net Zero / Leeds Sustainability Institute, August 2025. View the report. Covers infrared spectral bands, emitter characteristics, and infrared-heater typologies across materials.
- Hybrid 2.0 Full Spectrum Sauna Specification Sheet. Finnmark Designs, 2023. View the specification sheet. Model-specific specification identifying near-infrared LED, mid/far infrared, and far-infrared heating components. Finnmark is a brand carried by My Sauna Plus.
- Infrared Saunas: What They Do and 6 Health Benefits. Cleveland Clinic, April 14, 2022. health.clevelandclinic.org/infrared-sauna-benefits. Relevant section: "What are infrared saunas?"
- Cheng K, Martin LF, Slepian MJ, Patwardhan AM, Ibrahim MM. "Mechanisms and Pathways of Pain Photobiomodulation: A Narrative Review." The Journal of Pain. 2021;22(7):763-777. pmc.ncbi.nlm.nih.gov/articles/PMC8277709/. Distinguishes visible red and near-infrared light and discusses wavelength, intensity, and route of exposure.
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