Sunlighten sauna review: the four models side by side
The Signature I has eight far-infrared heaters. The Amplify II and Amplify III add full-spectrum heaters to a far-infrared set, and the Amplify RED III adds five near-infrared red-light heaters on top of that1357. The main choices are how many people sit in it, whether you want red light built in and what circuit you can give it.
Sunlighten doesn’t publish the red light’s wavelength or output, so the table says “not published” where that figure would go. These are Sunlighten’s own figures from its product pages, read on October 16, 2026. None of them was independently measured, and none is evidence of a health effect.
The Signature I is the saunas guide’s pick for one person, and the other three aren’t guide picks. Our saunas guide explains how that pick was chosen.
| Model | People | Heaters | Red light | Circuit |
|---|---|---|---|---|
| Signature I | 11 | 8 far-infrared. No full-spectrum or near-infrared heaters listed1 | None listed1 | 120 V, 1,350 W. Dedicated 20 A circuit, NEMA 5-20R outlet1 |
| Amplify II (Obsidian) | 23 | 5 far-infrared, 3 full-spectrum3 | Integrated red light not available on this model3 | 120 V, 1,880 W, 15.67 A. Dedicated 20 A circuit, NEMA 5-20R outlet3 |
| Amplify III (Obsidian) | Up to 35 | 7 far-infrared, 3 full-spectrum5 | Integrated red light not available on this model5 | 120 V on a dedicated 20 A circuit. Wattage and outlet type not published5 |
| Amplify RED III | Up to 37 | 7 far-infrared, 3 full-spectrum, 5 near-infrared red light7 | Built in. Wavelength and output not published7 | 240 V, 3,465 W, 14.44 A. Dedicated 20 A circuit, NEMA 6-20R outlet7 |
Sunlighten sauna price: what each model costs
All four prices are sale prices on Sunlighten’s own US store, before tax. Each page also prints a higher regular price, shown in the table. Freight to the contiguous US is free, and no page gives an end date for the sale18. The first two steps up cost $1,000 each. The RED III costs $1,600 more than the Amplify III.
Prices and stock were rechecked on October 18, 2026. The RED III’s store listing was unavailable, and its page offered a pre-order only, through a sauna consultant. It showed the same way on October 1678. Ask the consultant about the delivery date, because the page gives none for a pre-order.
Sunlighten’s product pages show Truemed, Affirm and Klarna checkout options1357. They are ways to pay, not discounts, and none changes the prices below.
| Model | US price | Availability | Warranty | Returns |
|---|---|---|---|---|
| Signature I | $4,999 sale (regular $5,499)2 | Available. The page says ready to ship, arriving in 12 to 14 days12 | 7 years on cabinet and heaters, 3 on controls, 1 on glass door and audio. The general terms exclude labor9 | Unopened only, within 30 days of delivery. Fees can include $499 restocking, 3%, storage and return shipping10 |
| Amplify II (Obsidian) | $5,999 sale (regular $6,899)4 | Available. The page says ready to ship, arriving in 12 to 14 days34 | Same as the Signature I9 | Same as the Signature I10 |
| Amplify III (Obsidian) | $6,999 sale (regular $8,099)6 | Available. The page says ready to ship, arriving in 12 to 14 days56 | Same terms as the Signature I. Our review lists whether the no-labor line covers the whole cabin as unclear9 | Same as the Signature I10 |
| Amplify RED III | $8,599 sale (regular $9,899)8 | Not available. The store listing says unavailable, and the page offers a pre-order through a sauna consultant. Same on Oct 16 and Oct 1878 | Same as the Signature I9 | Same as the Signature I10 |
Which Sunlighten fits you
Each suits a different need, and this isn’t a ranking. Start with how many people will sit in it, then check the circuit you can give it.
- One person: the Signature I. It’s $4,999 on sale and 37.8 in wide, and Sunlighten says its panels fit through a 30 in doorway12. It’s the saunas guide’s pick for one person. The catch: it needs its own 20 A circuit, it lists far-infrared heaters only and an opened cabin can’t be returned110.
- Two people: the Amplify II. It’s $5,999 on sale with a 45.2 in bench, five far-infrared and three full-spectrum heaters, and the same 120 V, 20 A circuit as the Signature I34. The catch: Sunlighten publishes no top temperature, it weighs 541 lb and an opened cabin can’t be returned310.
- Three people: the Amplify III. It’s $6,999 on sale with a 56.7 in bench, $1,000 more than the Amplify II56. The catch: Sunlighten doesn’t publish its wattage or top temperature, so running costs are unknown, and it weighs 642 lb5.
- Red light built in: the Amplify RED III. It’s $8,599 on sale, $1,600 more than the Amplify III, and adds five near-infrared red-light heaters78. The catch: it needs a dedicated 240 V circuit, Sunlighten doesn’t publish the red light’s wavelength or output, and it was pre-order only on October 1878.
If you’d rather not buy a Sunlighten
Two people on a standard plug: the Health Mate Enrich 2 is the saunas guide’s pick for that. It lists at $5,300 with free curbside delivery (rechecked October 18), plugs into a standard 120 V, 15 A outlet, and Health Mate says no electrician is needed12. The catch: its 1,780 W rating works out to about 14.8 A, so that circuit can carry little else. Warranty labor is at your expense, and a return costs a 20% restocking charge plus shipping1214. Read the Enrich 2 review.
Clearlight’s Sanctuary 1 (one person) and Sanctuary 2 (two people) are sold by quote only. Clearlight’s pages showed “Get Pricing” and no price on October 181516. The Sanctuary 1 plugs into a 120 V, 15 A outlet and the Sanctuary 2 into a 120 V, 20 A outlet1516. Clearlight covers parts and shipping for as long as you own the cabin, with labor for 7 years indoors per its manual1718. A return costs a 25% restocking charge plus shipping19. For the full side-by-side, see Sunlighten vs Clearlight in our cabin comparison.
Circuit, warranty and returns: read these before you order
The Amplify pages tell you to book an electrician so the outlet is ready on build day, and no Sunlighten page prices the electrical work357. The warranty prohibits a power strip, extension cord or converter, and a shared circuit voids it. So does putting the cabin within 5 ft of water9.
The carrier leaves the cabin on a pallet in your garage or on a flat, paved driveway and won’t take it up steps. Two people assemble it in about 2 to 3 hours1357. Sunlighten warns that the magnets used to assemble its saunas can interfere with pacemakers11.
The warranty and return terms are the same on all four, and the returns are strict: only an unopened cabin goes back, so check the circuit and the path into the room before the pallet arrives. None of these specs is evidence of a health effect. Our sauna evidence review covers what studies of traditional and infrared saunas found, and our three-year sauna cost page covers what a home sauna costs to run.
Sources
- Signature I - Eucalyptus Sunlighten · manufacturer
- Signature I - Eucalyptus store listing (variant price and availability) Sunlighten · manufacturer · price read from the store’s product data
- Amplify II - Eucalyptus - Obsidian Sunlighten · manufacturer
- Amplify II - Eucalyptus - Obsidian store listing (variant price and availability) Sunlighten · manufacturer · price read from the store’s product data
- Amplify III - Eucalyptus - Obsidian Sunlighten · manufacturer
- Amplify III - Eucalyptus - Obsidian store listing (variant price and availability) Sunlighten · manufacturer · price read from the store’s product data
- Amplify RED III - Eucalyptus Sunlighten · manufacturer
- Amplify RED III - Eucalyptus store listing (price, regular price and availability) Sunlighten · manufacturer · price read from the store’s product data
- Sunlighten warranty (US and Canada) Sunlighten · manufacturer
- Sunlighten returns and cancellation policy Sunlighten · manufacturer
- Contraindications Sunlighten · manufacturer
- Health Mate Enrich 2 official product page Health Mate · manufacturer
- Health Mate Enrich Series (magnet model) owner's manual (PDF) Health Mate · manufacturer
- Health Mate shipping and returns policy Health Mate · manufacturer
- Sanctuary 1 Infrared Sauna Clearlight · manufacturer
- Clearlight Sanctuary 2 official product page Clearlight · manufacturer
- Clearlight Sauna Limited Lifetime Warranty Clearlight · manufacturer
- Clearlight Sanctuary owner's manual (PDF, covers Sanctuary 1, 2, 3, Y, Retreat and C; undated) Clearlight · manufacturer
- Sauna Shipping & Return Policy Clearlight · manufacturer
How this was written. Written from the sources listed above, checked . It is general information, not medical advice. Talk to a clinician before acting on anything here if you have a health condition or take medication.
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