“Full spectrum” means a cabin pairs far-infrared panels with emitters the brand calls near- or mid-infrared. The label is the same across brands. The layouts behind it are not.
This page puts the three full-spectrum cabins in our catalog side by side, plus one cabin that mixes heater types under a different name. For heaters, EMF, and circuits in general, start with the infrared sauna buying guide.
Short answer: the Finnmark FD-1 ($4,695) is the 1-person pick, reaching 170°F on a 120V/15A plug. The Finnmark FD-3 ($6,495) seats four, also reaches 170°F, and needs 240V. The Clearlight Sanctuary 2 seats two on a 120V/20A outlet and carries a limited lifetime warranty, but has no published price.
Side by side
| Finnmark FD-1 | Clearlight Sanctuary 2 | Finnmark FD-3 | |
|---|---|---|---|
| Seats | 1 | 2 | 4 |
| Full-spectrum heaters | Spectrum Plus short-wave, plus LED near-infrared ceiling lights | Two 500W True Wave Full Spectrum emitters, front wall | Spectrum Plus short-wave panels |
| Far-infrared heaters | Spectrum Carbon 360 long-wave | Back, sides, and floor | Carbon 360 long-wave |
| Total power | 1,750W | Not in our data | 3,150W |
| Circuit | 120V/15A, NEMA 5-15P | 120V/20A, NEMA 5-20P | Dedicated 240V, 15A |
| Top heat | 170°F | Not in our data | 170°F |
| Interior | 34” x 32” x 70” | 46.5” x 44.25” x 72.5” | 67” x 41” x 70” |
| Weight | 301 lbs | 450 lbs | 488 lbs |
| Warranty | Limited, term not stated | Limited lifetime, original owner | Limited, term not stated |
| Price | $4,695 | Quote only | $6,495 |
From Finnmark (via Select Saunas) and Clearlight listings, checked September to October 2026.
Finnmark FD-1: one person, full heat
The FD-1 is 38” square outside and reaches 170°F on a household plug, with a Western Canadian cedar interior. Finnmark links an EMF test log and ETL certification on the listing.
Run the numbers on the plug. A 15A circuit at 120V carries 1,800W (15 x 120). The FD-1 draws 1,750W, which is 97% of that. Put it on a circuit nothing else uses.
Clearlight Sanctuary 2: two people, longest warranty
The Sanctuary 2 puts its two 500W full-spectrum emitters on the front wall and far-infrared heaters on the back, sides, and floor. It runs on a 120V/20A outlet with app control. The warranty is limited lifetime for the original owner, the clearest term of the three.
You get the warranty and the 2-person size on a plug-in outlet. You give up a published price: Clearlight quotes after a consultation.
Finnmark FD-3: four people, 240V
The FD-3 is 72” wide outside and pairs long-wave carbon panels with UL-listed short-wave Spectrum Plus panels. Its 3,150W needs a dedicated 240V, 15A circuit, so budget for an electrician if you don’t have one.
Run the numbers per cubic foot
Interior volume from the listed dimensions:
| Cabin | Interior volume | Watts | Watts per cu ft |
|---|---|---|---|
| Finnmark FD-1 | 44.1 cu ft | 1,750W | 39.7 |
| Finnmark FD-3 | 111.3 cu ft | 3,150W | 28.3 |
| Clearlight Sanctuary 2 | 86.3 cu ft | Not in our data | Not available |
Here’s what the spec sheet won’t tell you. The FD-1 has about 40% more heater power per cubic foot than the FD-3, yet both list the same 170°F maximum. That suggests the smaller cabin has more power to spare, but neither listing gives a heat-up time to confirm it.
A cabin that mixes heaters under another name
The Health Mate Enrich 2 ($5,300) seats two and combines Tecoloy dual-wave heaters on the walls and bench with True Infra far-infrared heaters at the floor and lower back, on 120V/15A at 1,780W. Health Mate doesn’t call it full spectrum, but it is the same idea: more than one heater type in one cabin. It also adds a 96-diode red light array and a limited lifetime warranty on the unit.
What to ask before you buy
- How many watts come from the full-spectrum emitters, and how many from the far-infrared panels?
- What wavelength does each emitter produce, with a test report?
- Does the warranty cover each heater type for the same term?
Cleveland Clinic gives 110 to 135°F as the typical range for infrared saunas, so the 170°F on the Finnmark listings is above what most sessions use.
My rule of thumb: choose a full-spectrum cabin by seats and circuit first. The heater layout is the tiebreaker, not the starting point.
To see a full-spectrum cabin next to far-infrared alternatives, see our infrared sauna comparison.
Bottom line: the FD-1 for one person on a household plug, the Sanctuary 2 for two with the clearest warranty, and the FD-3 for four if you can run 240V.
Sources
- Cleveland Clinic, “6 Possible Benefits of Infrared Saunas,” October 9, 2026: health.clevelandclinic.org
- Heater layouts, power, dimensions, weights, warranties, and prices: Finnmark (via Select Saunas), Clearlight, and Health Mate listings, checked September to October 2026