What Is the Best Full Spectrum Infrared Sauna?
The best full spectrum infrared sauna for most buyers is the Peak Saunas Shasta (1-person, $6,450) or Fuji (2-person, $7,950). Both deliver near/mid/far infrared across the complete wavelength spectrum, low EMF, and an integrated medical-grade red light therapy panel — the only consumer sauna brand to combine all three modalities in one unit. Full spectrum infrared penetrates deeper than far-infrared-only saunas, engaging different tissue layers for more complete therapeutic benefit.
The infrared sauna market is crowded with claims. "Full spectrum," "far infrared only," "near infrared," "broad spectrum" — the terminology can be bewildering. This guide cuts through the noise: what full spectrum infrared actually means, why it matters, how Peak Saunas compares to the competition, and which model is right for your space and budget.
What Is Full Spectrum Infrared? Near, Mid, and Far Explained
Infrared radiation is invisible light on the electromagnetic spectrum, just beyond visible red light. It's divided into three wavelength bands, each with distinct penetration depth and biological effects:
Near Infrared (NIR) — 700–1,400 nm
The shortest wavelength, with the shallowest tissue penetration (roughly 1–2mm). Near infrared is best known for its photobiomodulation effects — stimulating cellular energy production (ATP synthesis) at the mitochondrial level. Research suggests NIR supports skin health, wound healing, and collagen production. It's also the wavelength used in most red light therapy devices.
Mid Infrared (MIR) — 1,400–3,000 nm
Penetrates more deeply than near infrared, reaching soft tissue, muscles, and joints. Mid infrared is associated with improved circulation, pain relief, and cardiovascular benefits. It heats tissues that far infrared can't reach as efficiently.
Far Infrared (FIR) — 3,000 nm–1 mm
The most common infrared type in saunas — and the deepest penetrating. Far infrared penetrates 3–4cm into tissue, generating core body heat that promotes heavy sweating, detoxification, and cardiovascular stress similar to moderate exercise. Most budget infrared saunas use FIR only.
Why Full Spectrum Matters
A full spectrum sauna delivers all three wavelength ranges simultaneously. Instead of choosing one biological effect, you get the complete infrared benefit profile in every session:
- Cellular energy activation (NIR)
- Deep muscle and joint penetration (MIR)
- Core body heating and heavy sweat detox (FIR)
Far-infrared-only saunas are effective — but full spectrum is a meaningful upgrade if you're investing in a long-term home wellness tool.
Full Spectrum Saunas vs. Far Infrared Only — Head to Head
| Feature | Full Spectrum (Peak Saunas) | Far Infrared Only |
|---|---|---|
| Wavelength coverage | Near + Mid + Far | Far only |
| Tissue penetration depth | Surface to 4cm+ | 3–4cm (deep only) |
| Skin & cellular benefits | Yes (NIR photobiomodulation) | Minimal |
| Red light therapy | Included on most Peak models | Rarely included |
| Sweat / detox | Yes (FIR component) | Yes |
| Price premium | Modest ($500–$1,500 over FIR-only) | Base pricing |
The Full Spectrum Peak Saunas Lineup
Peak Saunas offers full spectrum infrared on 10 of 12 models (all except the Olympus and Aspen, which are FAR infrared only). Here's the breakdown by capacity:
1-Person Full Spectrum Models
Peak Saunas Shasta — $6,450 (Bestseller)
1-person | Hemlock | 42"W × 40"D × 75"H | Front-facing medical-grade RLT panel (216 dual-chip LEDs, 8 wavelengths) | Standard 120V/15A outlet | In stock, ships 5–7 days
Peak Saunas Rainier — $6,950
1-person | Canadian Red Cedar | Same specs as Shasta | For buyers who want cedar's natural aroma and richer appearance over hemlock's hypoallergenic modern look.
2-Person Full Spectrum Models
Peak Saunas Everest — $7,450
2-person | Hemlock | 53"W × 44"D × 75"H | Front-facing RLT panel | Calf + floor heaters | Requires dedicated 120V/20A outlet (electrician ~$150–250)
Peak Saunas Fuji — $7,950
2-person | Canadian Red Cedar | Identical to Everest in every spec | The most popular 2-person model | Requires dedicated 120V/20A outlet
3-Person Full Spectrum Models
Peak Saunas Denali — $9,250
3-person | Hemlock | 61"W × 44"D × 75"H | Built-in RLT panel | Calf + floor heaters | Requires dedicated 240V/20A circuit
Peak Saunas Matterhorn — $10,250
3-person | Canadian Red Cedar | Dual RLT panels (maximum coverage) | Same dimensions as Denali | 240V/20A required
Outdoor Full Spectrum Models
All three Peak outdoor models (Patagonia 2-person $10,250, El Capitan 4-person $14,750, Kilimanjaro 5-person $12,950) include full spectrum infrared, low EMF, and medical-grade RLT. All require 240V dedicated outdoor circuits.
Peak Saunas vs. Competitors: Full Spectrum Comparison
Peak Saunas
- Full spectrum (NIR + MIR + FIR) standard on 10 models
- Medical-grade red light therapy panel included
- low EMF (avg low EMF) across all models
- Price range: $6,450–$14,750 for full spectrum models
- Unique claim: Only consumer brand combining full spectrum + low EMF + integrated RLT in one unit
Sunlighten
- Full spectrum available on mPulse series
- No integrated RLT panel on most models
- Premium brand — mPulse models start at ~$8,000+
- Strong clinical research backing
Clearlight (Jacuzzi)
- Full spectrum on select models (Sanctuary series)
- Strong EMF-reduction engineering
- No standard RLT panel inclusion
- Starting price higher than equivalent Peak models
Dynamic Saunas
- Primarily far-infrared-only lineup
- Limited full spectrum options
- Budget-friendly entry point ($1,200–$3,000)
- EMF shielding inconsistent across models
JNH Lifestyles
- FAR infrared only on most models
- No RLT integration
- Budget-tier brand ($600–$2,500)
Bottom line for full spectrum shoppers: If you want full spectrum infrared + red light therapy + low EMF as a combined package, Peak Saunas is the only brand engineering all three together. Competitors offer one or two of these features — rarely all three, and rarely at this price point.
How to Choose the Right Full Spectrum Sauna for You
Step 1: Decide on Capacity
- Solo use only: Shasta ($6,450) — no-brainer. Best value in the 1-person full spectrum category.
- Using with a partner sometimes: Go 2-person. Fuji ($7,950) or Everest ($7,450). The extra $500–$1,000 over the 1-person buys dramatically more space.
- Family use: Denali ($9,250) or Matterhorn ($10,250) — 3-person, dual RLT panels on the Matterhorn.
Step 2: Cedar vs. Hemlock
- Cedar (Rainier, Fuji, Matterhorn): Classic sauna aroma, rich reddish appearance, naturally moisture-resistant
- Hemlock (Shasta, Everest, Denali): Hypoallergenic, lighter/modern look, minimal scent — ideal for scent-sensitive users
Both woods are Canadian-sourced and equally durable. It comes down to aesthetic and scent preference.
Step 3: Check Electrical Requirements
- Standard 120V/15A (no electrician): Shasta, Rainier
- Dedicated 120V/20A (~$150–250 for outlet): Fuji, Everest
- Dedicated 240V/20A (~$200–400, like dryer outlet): Denali, Matterhorn
- Dedicated 240V/30A (~$300–500): Outdoor models
Step 4: Indoor vs. Outdoor
If you have a covered patio, deck, or yard space, Peak's outdoor full spectrum models are worth considering — they free up interior square footage entirely and reach higher temperatures (170°F vs. 150°F for indoor models).
The Red Light Therapy Bonus: Why It Matters
Most buyers research full spectrum infrared without considering red light therapy — then discover it's included in their Peak unit and ask what to do with it.
Red light therapy (RLT) uses visible red and near-infrared wavelengths (typically 630–850nm) to stimulate cellular energy production via photobiomodulation. Clinical research has linked it to:
- Improved skin health and collagen production
- Reduced joint pain and inflammation
- Enhanced muscle recovery post-exercise
- Improved sleep quality
- Wound healing acceleration
Peak's medical-grade RLT panels use 216 dual-chip LEDs across 8 wavelengths, controlled separately via the Peak Saunas RLT App. You can run the sauna and RLT simultaneously, or use either independently.
Standalone red light therapy devices from brands like Joovv start at $600 for a small panel. Getting a full-body medical-grade RLT panel bundled with a full spectrum sauna at Peak's price points represents significant added value per dollar spent.
The Bottom Line: Which Full Spectrum Infrared Sauna Should You Buy?
For first-time buyers: Peak Saunas Shasta ($6,450). Full spectrum heat, medical-grade red light therapy, low EMF, standard outlet, compact footprint. The most complete 1-person infrared wellness unit at this price point.
For couples or shared use: Peak Saunas Fuji ($7,950). Cedar, front-facing RLT panel, calf + floor heaters, 2-person capacity. Worth every dollar of the $1,500 step-up from the Shasta.
For families: Peak Saunas Matterhorn ($10,250). Dual RLT panels, 3-person, cedar — the flagship of the Peak indoor lineup.