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Our one-person cabin pick

Sunlighten Signature I

1-person installed far-infrared cabin, eucalyptus

$4,999US price, checked Oct 13, 2026

One-person far-infrared cabin that needs its own 120 V, 20 A circuit

Check price at Sunlighten Full review →

Installed infrared cabin

Sunlighten Amplify II

2-person installed infrared cabin, black Obsidian exterior with eucalyptus interior, no red-light option

$5,999US price, checked Oct 13, 2026

Two-person cabin with eight heaters on a dedicated 120 V circuit

Check price at Sunlighten Full review →

Criterion	Sunlighten Signature I	Sunlighten Amplify II
US price	$4,999Checked Oct 13, 2026 · Price details in the review	$5,999Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$5,371.52 Incomplete known subtotal. Electricity assumption: $0.18/kWh. Not included: installation.	$5,999 Incomplete known subtotal. Not included: installation, energy use.
Choose if	One person with a dedicated 120 V, 20 A circuit and about 38 × 40 in of indoor floor.	Two people with a dedicated 120 V, 20 A circuit, about 51 × 46 in of indoor floor and a paved path for freight.
Main trade-off	You can't return it once the boxes are opened, and the warranty doesn't pay for labor.	Opened saunas can't be returned, warranty labor is on you, and the panel magnets can affect pacemakers.
Key specifications	Heaters: 8 far-infrared heaters, with Sunlighten's SoloCarbon heater named as a feature. No near-infrared or full-spectrum heaters are listed, and per-heater wattage isn't stated Electrical: 120 V, 1,350 W, 20 A. Dedicated 120 V, 20 A circuit with a NEMA 5-20R outlet (5-20P plug) Inside and seating: 32.2 W × 33.6 D × 70.3 H in. One bench, 32.1 W × 20.2 D in and 19.5 in high, for one person Outside and weight: 37.8 W × 39.8 D × 77.7 H in with feet, 428 lb. Leave 4 in to the walls and 12 in above Heat: Up to 170°F. Sunlighten suggests preheating for 45 to 60 minutes and says it warms about 1°F per minute Delivery and assembly: Freight to a garage or flat, paved driveway, left on a pallet. Two people assemble it in about 2 to 3 hours Running cost: Sunlighten estimates 15 to 35 cents an hour Extras: Bluetooth sound system, chromotherapy lights, CELLIANT heater cover and a Reservation Mode that starts the preheat	Heaters: 5 SoloCarbon far-infrared heaters and 3 halogen full-spectrum heaters. Wattage of each isn't stated Electrical: 120 V, 1,880 W, 15.67 A. Dedicated 120 V, 20 A circuit with a NEMA 5-20R outlet Inside and seating: 45.4 W × 39.9 D × 70.3 H in. One bench, 45.2 W × 20.3 D in and 19.5 in high, for one or two people Weight: 541 lb Delivery and assembly: Freight on a pallet to your garage or a flat, paved spot on the driveway. Two people assemble it in about 2 to 3 hours Options: Eucalyptus or Obsidian at the same price, basswood $200 less. Integrated red light isn't available. The 3-person size costs $1,000 more Extras: Bluetooth sound system, chromotherapy lights and controls that let you lower the temperature Warranty (home use): 7 years on cabinet and heaters, 3 years on controls, 1 year on glass door and audio. Labor not covered
Exact variant	1-person installed far-infrared cabin, eucalyptus	2-person installed infrared cabin, black Obsidian exterior with eucalyptus interior, no red-light option
Dimensions	Outside: 37.8 W × 39.8 D × 77.7 H in, including 2 in feet. Inside: 32.2 W × 33.6 D × 70.3 H in. The door opening is 28 in, and the door swings outward to the right. The bench is 32.1 in wide and 20.2 in deep, 19.5 in off the floor. It weighs 428 lb. Sunlighten recommends 4 in of clearance from the walls and 12 in above the cabin. It says the cabin fits under a standard 8 ft ceiling and its panels fit through a standard 30 in doorway.	Outside: 50.9 W × 45.9 D × 77.7 H in, including 2 in feet. Inside: 45.4 W × 39.9 D × 70.3 H in. The door opening is 28 in. The bench is 45.2 in wide and 20.3 in deep, 19.5 in off the floor. It weighs 541 lb. Sunlighten says it fits under a standard 8 ft ceiling and its panels fit through a standard 30 in doorway. The product page gives no clearance to leave around the cabin.
Installation	It needs a dedicated 120 V, 20 A circuit and outlet. The outlet is a NEMA 5-20R, and the plug is a NEMA 5-20P. Sunlighten's FAQ says a power strip or converter voids the warranty. The warranty page also rules out extension cords and non-dedicated circuits. The same page requires at least 5 ft between the sauna and a cold plunge, shower or bathtub. The product page doesn't say whether you need an electrician or GFCI protection. It points you to the spec sheet for electrical details. Sunlighten's support page links an owner's manual, spec sheet, assembly guide and power box installation guide. Those PDFs couldn't be opened for this review. Freight delivery goes to a garage or flat, paved driveway. The carrier leaves the sauna there on a pallet and can't carry it up steps. It comes in two to three mattress-sized boxes of 130 lb each, and you need at least two people to unpack and carry in the panels. The Magne-Seal panels lock together without screws or nails. Sunlighten says two people take about 2 to 3 hours.	It needs a dedicated 120 V, 20 A circuit with a NEMA 5-20R outlet. Sunlighten rates it at 1,880 W and 15.67 A. The product page tells you to book an electrician so the outlet is ready, but doesn't mention GFCI protection. Under Sunlighten's warranty, a power strip, extension cord, converter or non-dedicated circuit voids coverage. So does placing it within 5 ft of a shower, bathtub or cold plunge. Sunlighten says its saunas aren't designed to be placed outdoors. If you put one outside anyway, its separately sold cover and plastic sheet must stay on, even during sessions, or the warranty is void. Freight needs a flat, paved surface up to your garage door. The carrier leaves the sauna on a pallet in the garage or on the driveway and can't take it up steps. A local agent calls to schedule delivery. It ships in two to three boxes of 130 lb each, and Sunlighten says to have at least two people to unpack. The Magne-Seal panels lock together without screws or nails. Sunlighten says two people take about 2 to 3 hours. Its support page links an owner's manual, spec sheet, assembly guide and power box guide, but those PDFs couldn't be opened for this review.
Materials	Eucalyptus, which Sunlighten says is sustainably sourced, with natural variation in tone and grain. Basswood was marked not available, and the Obsidian finish is sold on a separate page. It comes with a CELLIANT heater cover. Sunlighten says the glue is non-toxic, citing third-party testing by Franklin International.	The outside has a limited-edition black finish that Sunlighten calls Obsidian. The inside is natural eucalyptus, which Sunlighten says is sustainably sourced. Plain eucalyptus costs the same, and basswood is $200 less. It comes with a CELLIANT heater cover.
Warranty	Sunlighten's warranty page covers its mPulse, Signature and Amplify cabins under one set of terms. For home use, the cabinet and heaters get 7 years. The cabinet includes the bench, floor grates and heater cover frames. The controls (in-sauna tablet, control pad and power box) get 3 years. The glass door and audio get 1 year, and chromotherapy has a separate 1-year warranty. Commercial use gets 5 years on the cabinet and heaters and 1 year on everything else. It covers replacement parts only, not labor or technician costs. You pay the freight on parts shipped for service. It covers only the original buyer and ends if you sell the sauna. It's void on a power strip, extension cord, converter or non-dedicated circuit. It's also void within 5 ft of a shower, tub or cold plunge. Sunlighten's contraindications page adds that repairs attempted without consulting Sunlighten void it. Sunlighten says its saunas aren't designed for outdoor use. Outside, the separately sold sauna cover has to stay on at all times, even during sessions. The sauna must also be bought and put into use within a year of its manufacture date. The page shows no version or effective date.	The product page shows a 7-year warranty badge. Sunlighten's warranty page groups Amplify with its other cabin saunas. For home use, the cabinet and heaters get 7 years. The cabinet includes the benches, floor grates and heater cover frames. The controls (in-sauna tablet, control pad and power box) get 3 years. The glass door and audio get 1 year, and chromotherapy lighting has its own 1-year term. Commercial use gets 5 years on the cabinet and heaters and 1 year on everything else. The warranty's disclaimers say labor and technician costs aren't covered. You pay all freight, including on parts shipped for service. Coverage is for the original buyer only and ends if you sell the sauna. It's void on a power strip, extension cord, converter or non-dedicated circuit, or within 5 ft of a shower, bathtub or cold plunge. Sunlighten says its saunas aren't designed for outdoor use. Outside, the separately sold cover and its plastic sheet must stay on at all times. The sauna must be bought and put into use within a year of its manufacture date.
Returns	You can return or exchange it within 30 days of delivery, but only in the original, unopened packaging. Opened saunas can't be returned. Charges can include a 3% administrative fee, a $499 restocking fee for Signature saunas, storage fees and return shipping. You can cancel before it ships, but the same fees can apply. You start a return by emailing your sales rep or customer care for an authorization, and Sunlighten schedules the pickup. It refunds to your original payment method after it inspects and restocks the sauna. Sunlighten reserves the right to refuse a return, exchange or cancellation.	You have 30 days from delivery to start a return or exchange, and the sauna must be in its original, unopened packaging. Opened saunas can't be returned or exchanged. Returns, exchanges and cancellations may carry a 3% administrative fee and a $499 restocking fee for each Amplify sauna. Storage fees for re-routing the sauna and return shipping to the warehouse may also apply. Exchanges can add shipping back to you. If it hasn't shipped, you cancel by emailing your sales representative, or through Sunlighten's order portal if you don't have one. Refunds go to the original payment method once the sauna is received, inspected and restocked, with no stated timeframe. Sunlighten reserves the right to refuse a return, exchange or cancellation.
Unresolved questions	Whether an ETL listing covers Signature I, and its file number What the linked EMF test measured, on which models and at what distance Whether you need GFCI protection or a licensed electrician for the circuit What the owner's manual, spec sheet and power box installation guide require, since those PDFs couldn't be opened Average power draw once the cabin is up to temperature Carton weights, since two to three boxes of 130 lb each don't add up to 428 lb How many cleanings one $39 cleaning kit covers Whether the $4,999 sale price lasts past the October 14 event	The maximum cabin temperature The wattage of each heater and average power use during a session Measured EMF or ELF values and how they were tested Whether an ETL or UL listing covers this exact model, and its file number How much clearance it needs and whether it needs GFCI protection Carton weights, since two to three boxes at 130 lb each don't add up to the 541 lb listed weight Whether the $5,999 sale price lasts past the October 14 sale

These comparisons use published specifications, not head-to-head tests. Prices and terms are dated. Unknown costs are not zero. Check the exact variant before you buy.