Far Infrared vs Full Spectrum Sauna: Key Differences

Short answer: a far-infrared sauna heats you with carbon-panel heaters that emit mainly far-infrared wavelengths. A "full spectrum" sauna adds near- and mid-infrared heaters alongside those panels, aiming to deliver all three infrared wavelengths in one session. In practice, the difference is the heater technology inside the cabin — both run at the same comfortable 110–150°F, both are infrared, and full spectrum still includes far infrared. Here's how they compare.

This article is for information only and isn't medical advice. If you have a heart condition, high or low blood pressure, are pregnant, or take medication affecting heat tolerance, talk to your doctor before using any sauna. For the full safety picture, see our infrared sauna safety guide →

The three infrared wavelengths, in plain terms

Infrared is the part of the electromagnetic spectrum just beyond visible red light — invisible to the eye but felt as heat. The commonly used division splits it into three bands:

• Near infrared (NIR): roughly 0.7–1.4 microns. Produced by very hot sources — the glowing element in a toaster is a familiar example.
• Mid infrared (MIR): roughly 1.4–3 (sometimes to 4) microns. Produced by hot sources. The least studied of the three on its own.
• Far infrared (FIR): roughly 4–1,000 microns, with the sauna industry usually focused on the 5–15 micron range. Produced by lower-temperature sources like warm wall panels.

One caveat: the exact divisions vary by standard (the CIE and ISO schemes use different cutoffs), so "near" vs "far" is a naming convention, not a sharp boundary. What matters for a buyer is which heaters a sauna uses, because the heater's temperature decides which wavelengths it emits — cooler panels emit longer waves, hotter emitters emit shorter ones. Infrared sauna benefits, explained →

What a far-infrared sauna actually is

The classic infrared sauna — and the bulk of what's sold today — uses large carbon-panel heaters mounted in the walls, backrest, and sometimes the floor. These panels run at relatively low surface temperatures and emit predominantly far-infrared energy, producing gentle, enveloping warmth spread across your whole body.

It's the biggest segment of our catalog: we carry 71 far-infrared models from Dynamic Saunas, Maxxus Saunas, Golden Designs, and Finnmark, in low-EMF, ultra-low-EMF, and near-zero-EMF configurations. Browse far-infrared saunas →

If you're shopping for your first cabin, far infrared is the standard, widest-selection choice. Home sauna buying guide →

What "full spectrum" adds

Full-spectrum models keep the far-infrared carbon panels and add near- and mid-infrared heaters — typically hotter emitter elements (halogen or quartz-style lamps) alongside the panels. The idea is that you get all three wavelengths in one session instead of far infrared alone. Manufacturers commonly describe the near range as interacting more at the skin's surface while far infrared provides the deep enveloping warmth — treat those as marketing framings rather than settled medical facts.

In our catalog, full spectrum is the smaller segment: 46 models from Dynamic Saunas, Maxxus Saunas, Golden Designs, and Finnmark — almost all rated near-zero EMF (under 3 milligauss in the product specs), while the three Finnmark FD models are low-EMF. Golden Designs also makes two "hybrid" cabins — the Soria and the Toledo — that pair full-spectrum infrared with a traditional Harvia stove for steam-style heat. Browse full-spectrum saunas →

The practical differences at a glance

• Heaters: far infrared uses carbon panels only; full spectrum adds hotter near/mid emitter elements.
• Wavelengths: far infrared covers the long end of the spectrum; full spectrum spans all three bands.
• Heat experience: both operate in the same 110–150°F cabin range, and the thermostat setting works the same way. Heat can feel more intense close to the hotter near-infrared elements.
• EMF: nearly all full-spectrum models we carry are near-zero EMF (the three Finnmark FD models are low-EMF); far-infrared models span low-EMF, ultra-low-EMF, and near-zero-EMF tiers. Low-EMF saunas →
• Selection: far-infrared models are the wider selection — 71 models vs 46 full-spectrum models in our lineup.

Which should you buy?

Start with what you want from the cabin. If you want the standard infrared session most owners use — gentle, even heat from straightforward heater technology — a far-infrared model is the natural choice, and it's where the selection is widest.

If you specifically want near- or mid-infrared exposure in the same session — for example, you like the idea of the hotter, more surface-focused heat that near-infrared emitters produce — a full-spectrum cabin delivers that without giving up the far-infrared panels. One practical note: you can't add near-infrared emitters to a far-infrared cabin later, so buy the spectrum you want up front.

One common point of confusion: red light therapy is not the same thing as near infrared. Red light is visible light (the panels visibly glow red); near infrared is invisible. Red light therapy saunas, explained →

And once you've narrowed it to a model, the usage routine is the same either way. How to use an infrared sauna →

FAQs

Are full-spectrum saunas better than far-infrared saunas?

Not universally. Full-spectrum cabins add near- and mid-infrared heaters alongside the far-infrared panels, so you get all three wavelength bands in one session. Whether that matters to you depends on whether you want that exposure — far-infrared models remain the standard, widest-selection choice.

Do full-spectrum saunas get hotter than far-infrared saunas?

No — both operate in the same 110–150°F cabin range, and the thermostat works the same way. The near-infrared elements themselves run at much higher surface temperatures than carbon panels, so the heat can feel more intense when you sit close to those elements.

Is red light therapy the same as near infrared?

No. Red light therapy uses visible red light, while near infrared is invisible. Some cabins include both — our red light therapy guide → explains that combination.

Which brands make full-spectrum saunas?

We carry full-spectrum models from Dynamic Saunas, Maxxus Saunas, Golden Designs, and Finnmark — 46 models in all. Golden Designs also offers two hybrid cabins (the Soria and the Toledo) that pair full-spectrum infrared with a traditional stove.

Can I upgrade a far-infrared sauna to full spectrum later?

Not practically — the near/mid emitter hardware is built into the cabin. If you think you want full spectrum, choose it when you buy.