55th of 59 in Saunas

Sunlighten Signature I Far Infrared Sauna

Far infrared
1 person
Up to 141-160°F
120V dedicated (20A)

SVT Score, Lower

Usability4.7/10Social3.5/10The SVT Score is placed on its category's range

Versus

SVT SCORESRead review

A one-person indoor far infrared cabin in eucalyptus with eight carbon panels, on a dedicated 120 V circuit.

$4,999

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SKU: SL-SIGNATURE-1 Category: Saunas Brand: Sunlighten

Usability

4.7 out of 10

Temperature5150.8°F default in the manual; the brand gives 100 to 150°F for its infrared cabins

Better on temperatureSunlighten Amplify IIIThe brand rates it to 170°F in ideal conditions. $6,799Scores 9.0

Heating / Cooling Power10eight far infrared carbon panels, 1,350 W, one seat

Capacity1one seat

Better on capacitySunlighten Amplify IVSeats four. $8,999Scores 7.0

Build & Insulation5solid eucalyptus, walls 1.8 to 2.2 in thick, fabric-covered heater panels

Size: 37.8 by 39.8 by 77.7 in outside, 428 lb
Glass: door not stated as tempered on the spec sheet

Features & Water Care4chromotherapy light, Bluetooth audio, programmable timer with reservation mode

Not included: app control, an adjustable vent and a backrest (backrests sold separately)

Better on features & water careNordik Recovery NR2 2-Person Infrared SaunaLights. $2,999Scores 7.0

Verification2ETL claimed; Intertek names Signature Restore/Renew/Revive, not Signature I.

Searched: Intertek CSA UL CPSC Health Canada

Better on verificationNordik Recovery NR2 2-Person Infrared Sauna$2,999Scores 6.0

Warranty & Support5heaters seven years, controls three years, replacement parts only with no labour

Returns: 30 days, unopened only, less a $499 restocking fee and a 3% fee

Better on warranty & supportHealth Mate Enrich 2 SaunaThe controls carry ten years. $5,300Scores 10.0

Price

Option: Obsidian exterior $4,999.00 at shop-us.sunlighten.com

Strengths

Gentle far infrared heat from carbon panels
Fabric covers over the infrared heaters
Simple controls with a preheat timer
Small footprint for a corner indoors
Chromotherapy lights and Bluetooth audio built in

Drawbacks

Lower top temperature and gentler heat
Parts-only warranty with no labour cover
Needs a dedicated outlet wired by an electrician
No app or Wi-Fi control
Store pages make wellness claims we do not assess
Sized for one only

Verdict

A simple, well-made cabin for one, but the heat is gentle

Social score

3.5 out of 10

RedditBrand-level3 out of 10

r/infraredsauna: an owner warns against buying after support confirmed a defective unit following hours of calls (2026)
r/infraredsauna: a shopper close to buying held off over owners' reports of poor service after the sale (Jun 2026)

Google4 out of 10

Brand-level. sauna.guide confirms two BBB complaints of a cabin glass door shattering in October and November 2025 and counts 46 BBB complaints in three years; it traces no source for a 5 to 15 mG EMF rumour (Oct 2026)

YouTubeNot scored

The YouTube pool is blank: a web search in November 2026 turned up Sunlighten videos only from testers with affiliate links or a brand tie, and one comparison whose independence is unclear (November 2026).

AmazonNot scored

The Amazon pool is blank: No Sunlighten store or listing was found on Amazon US in November 2026; Amazon search pages send shoppers to the brand's own store (November 2026).

User reviewsNot scored

No listing of these saunas was found at Walmart, Home Depot, Lowe's, Best Buy or REI in November 2026, so the retailer pool is blank.

Trustpilot

Trustpilot shows 4.6 from 4,092 reviews in October 2026, with 86% five-star and 6% one-star.
Sunlighten has claimed its Trustpilot page and invites customers to review.

Track record

BBB rates Sunlighten A+ and has accredited it since 2004.
BBB lists 48 grievances filed in the three years to October 2026.
A search of CPSC and Health Canada recall notices in November 2026 showed no Sunlighten sauna recall.

Not countedExcluded

Not counted in any pool: Sunlighten's own store and Trustpilot product reviews, its own channels and social pages, and testers it supplied or who carry its discount codes.
The retailer pool is blank: a web search of Walmart, Home Depot, Lowe's, Best Buy and REI turned up no listing of this sauna (November 2026).

Specs

TypeInfrared
HeaterFar infrared
FormCabin
PlacementIndoor
Seats1 person
Max Temperature141-160°F
Min TemperatureNot applicable
Capacity (Gallons)Not applicable
ChillerNot applicable
HeatsNot applicable
Water CareNot applicable
Power Supply120V dedicated (20A)
EMF Claimed"Low EMF" with no figure
EMF MeasuredNot measured
CertificationsClaimed only
Warranty3 Years

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At a glance

Eight carbon panels
Magnetic-lock panels
10 ft roof cord

Company

The company is based in Leawood, Kansas, and was founded in 1999.
Sunlighten bought the assets of a cold-plunge maker in May 2025 and runs them as its subsidiary Ice Barrel, LLC.
That subsidiary's own store also sells the Amplify line.

Where it sells

Sunlighten, Inc. sells saunas from a one-person dome to four-person full spectrum cabins on its own US store, shop-us.sunlighten.com.
Its mPulse cabins are sold through sauna consultants without a priced cart.
No Sunlighten store or listing was found on Amazon US in November 2026.

Description

The Sunlighten Signature I is a one-person indoor far infrared cabin with eight SoloCarbon carbon panels drawing 1,350 W in total. It needs a dedicated 120 V 20 A circuit with a NEMA 5-20 outlet, fed by a 10 ft cord that leaves the roof.

It measures 37.8 by 39.8 by 77.7 inches outside and 32.2 by 33.6 by 70.3 inches inside, weighs 428 lb, and has a 28 inch door. The manual sets it to 150.8°F by default, and the brand gives 100 to 150°F as the range of its infrared cabins.

Chromotherapy lights, a Bluetooth sound system, fabric heater covers and a programmable timer with a reservation mode come with it. The Obsidian exterior is the same cabin at the same $4,999.00. Backrests, cushions and comfort packages are sold separately.

Panels lock together with magnets and arrive by freight to the garage.