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Installed infrared cabin

Sunlighten Amplify RED III

3-person infrared cabin with integrated red-light configuration

$8,599US price, checked Oct 13, 2026

Three-person cabin with built-in red light that needs a 240 V circuit

Check price at Sunlighten Full review →

Installed infrared cabin

Clearlight Sanctuary 1

1-person indoor full-spectrum infrared cabin, mahogany (basswood also offered), 120V/15A plug-in

Price on requestNo published price, checked Oct 13, 2026

One-person full-spectrum cabin that plugs into a standard 120V outlet

Check price at Clearlight Full review →

Criterion	Sunlighten Amplify RED III	Clearlight Sanctuary 1
US price	$8,599Checked Oct 13, 2026 · Price details in the review	Price on requestChecked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$8,599 Incomplete known subtotal. Not included: installation, energy use.	Not enough data Incomplete known subtotal. Not included: purchase price, installation, other annual costs, energy use.
Choose if	Two or three people who want red light built into their sauna and can add a dedicated 240 V, 20 A circuit.	A solo user with about 42.5 × 48.25 in of floor space who wants full-spectrum heaters running off a standard 120V, 15A outlet.
Main trade-off	You pay $1,600 extra for red light with no published wavelength or dose, and opened saunas can't be returned.	There's no published price, labor is covered for 7 years rather than for life, and the 14.6A draw leaves little headroom on a 15A circuit.
Key specifications	Heaters: 7 far-infrared, 5 near-infrared red-light and 3 full-spectrum heaters. The red light's wavelength and output aren't stated Electrical: 240 V, 3,465 W and 14.44 A, on a dedicated 20 A circuit with a NEMA 6-20R outlet Inside and bench: 56.8 W × 39.9 D × 70.3 H in inside. The bench is 56.6 W × 20.2 D in and 19.5 in off the floor Top temperature: Up to 170°F, which Sunlighten qualifies with "in ideal conditions" Heat-up: Sunlighten suggests preheating for 45 to 60 minutes. It says the cabin warms about one degree per minute, depending on room temperature Weight and delivery: 710 lb in two to three boxes on a pallet, left in your garage or driveway. Two people assemble it in about 2 to 3 hours Extras: Chromotherapy lighting and a sound system Options: The 2-person Amplify RED II costs $900 less and the 4-person Amplify RED IV $1,700 more. Without red light, the same-size Amplify III Eucalyptus is $1,600 less	Heaters: Two 500 W True Wave full-spectrum heaters on the front wall. True Wave far-infrared heaters on the back wall, side walls, behind the calves and under the floor (count and wattage not stated) Electrical: 120 V, 1,740 W, 14.6 A. Plugs into a 120 V, 15 A outlet with a NEMA 5-15P plug Capacity: Built for 1 adult Weight: 425 lb Operating temperature: 115–125°F, per Clearlight's FAQ, which says cabins typically reach that range even when set to 150°F. Another FAQ answer says 115–130°F. Neither figure is given for this cabin specifically Controls and extras: Digital keypad (temperature, time, lights, heater intensity, reservation mode), smartphone control, Bluetooth/AUX audio and charging station, 12-color chromotherapy. Red light therapy upgrade available EMF: Marketed as low EMF/ELF. The product page says the heaters "cancel out both EMF and ELF." Clearlight's FAQ says True Wave heaters measure less than 1 mG when tested directly on the heater. No test standard, lab or report is named.
Exact variant	3-person infrared cabin with integrated red-light configuration	1-person indoor full-spectrum infrared cabin, mahogany (basswood also offered), 120V/15A plug-in
Dimensions	Outside: 62.3 W × 45.9 D × 77.7 H in, including 2 in feet. Inside: 56.8 W × 39.9 D × 70.3 H in. The door opening is 28 in. The bench is 56.6 in wide and 20.2 in deep, 19.5 in off the floor. The eucalyptus model weighs 710 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.	Exterior 42.5 W × 48.25 D × 77 H in. Interior 37.5 W × 45.5 D × 72.5 H in. Bench 35.5 W × 21.75 D × 19 H in. It weighs 425 lb. If you build it into an enclosed space, Clearlight recommends leaving 4 in around the sauna.
Installation	It needs a dedicated 240 V, 20 A circuit and a NEMA 6-20R outlet for its 6-20P plug. Sunlighten tells you to book your electrician early so the outlet is ready on build day. Its FAQ says a power strip or converter voids the warranty. The warranty page also rules out extension cords and non-dedicated circuits. It requires at least 5 ft between the sauna and any source of water or vapor. The product page doesn't mention GFCI protection or clearance around the cabin. Freight arrives in two to three large boxes on a pallet, left in your garage or on a flat, paved driveway spot. The carrier calls first to schedule. The panels lock together with Magne-Seal corners, without screws or nails. Sunlighten says two people take about 2 to 3 hours. Its guides page has manuals and assembly guides for the standard Amplify II, III and IV, but none listed under Amplify RED.	It plugs into a standard 120 V, 15 A household outlet with a NEMA 5-15P plug. The product page doesn't say it needs a dedicated circuit. Shipping is advertised as free. The sauna arrives by freight with lift-gate service at a scheduled delivery appointment, and someone 18 or older must sign for it. Clearlight says two people usually assemble it in about 1 to 1.5 hours with a screwdriver and the included Allen wrench. Its FAQ says 1 to 3 hours. Clearlight offers installation service in some areas but doesn't state a price.
Materials	Eucalyptus tongue-and-groove boards on solid wood framing, which Sunlighten calls sustainably sourced and non-toxic. Basswood and Obsidian finishes were marked not available for this model. One line on the page says its saunas are made of basswood, which conflicts with the eucalyptus selection. Sunlighten says the glue on its boards was third-party tested by Franklin International.	Mahogany or basswood. Clearlight calls it furniture-grade natural wood and notes that grain and color vary from cabin to cabin.
Warranty	Sunlighten's warranty page groups Amplify with its other cabin saunas. For home use, the cabinet and heaters get 7 years, the controls 3 years, and the glass door and audio 1 year. Cabinetry includes benches, floor grates and heater cover frames. Controls include the control pad, in-sauna tablet and power box. Commercial use gets 5 years on the cabinet and heaters and 1 year on everything else. The cabin terms don't single out the red-light heaters. The general terms cover replacement parts only. 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 water. Outdoors, the plastic sheet of the sauna cover (sold separately) must stay on at all times, even during sessions. The sauna must be bought and put into use within a year of its manufacture date. The page shows no version or effective date.	Clearlight says its residential Limited Lifetime Warranty covers the entire sauna for as long as you own it. That means the heaters, control panels and electrical components, wood cabin, audio and chromotherapy lighting. Parts and shipping are covered for life, but labor isn't. The warranty page says labor is covered for an initial period without giving its length. The Sanctuary owner's manual, which lists Sanctuary 1, sets labor at 7 years for indoor home use in the US and Canada. The manual counts coverage from the purchase date. It also says the warranty can't be transferred without written consent from Sauna Works, which issues it. Commercial use falls under a 5-year warranty. The warranty page says registration is automatic when the sauna ships. The manual instead asks you to register within 30 days of purchase.
Returns	Non-custom saunas can be returned within 30 days of delivery, but only unopened in the original packaging. Opened saunas can't be returned. Fees can include a 3% administrative fee, a $499 restocking fee per Amplify sauna, storage fees and return shipping. Cancelling before it ships can cost the 3% fee, plus storage fees if it has to be rerouted.	Clearlight calls it a "30 Day Risk-Free Return Policy," but a return isn't free. You have 30 business days from receipt and need a return authorization (RMA). The sauna must be in new or like-new condition, with undamaged original packaging and all manuals. Clearlight deducts a 25% restocking charge and the original shipping charges. If the sauna shipped under a free or discounted shipping promotion, that means the actual freight cost. You also pay return shipping. Custom, private-label and non-standard models are non-refundable. Orders canceled before shipment are fully refunded. Concealed damage must be reported within 5 business days of delivery.
Unresolved questions	The red-light heaters' wavelength and irradiance, and whether they run at the same time as the far-infrared heaters Average power use during a session, and so the yearly running cost Whether the circuit needs GFCI protection, and how much clearance to leave around the cabin What the linked Amplify RED III spec sheet adds, since it couldn't be opened on Oct 13, 2026 Whether an ETL listing covers this exact model, and its file number What the Vitatech EMF test measured, at what distance, and whether it included the red-light heaters Whether it's in stock, since the product page and Sunlighten's store listing disagreed The lifespan and replacement price of the full-spectrum and red-light heaters Whether the $8,599 sale price lasts past the October 14 event	The current quoted price, and whether the Save $600 promotion applies Whether the owner's manual or spec sheet recommends a dedicated circuit (the linked spec sheet couldn't be opened) Whether the red light therapy upgrade needs a bigger circuit. Clearlight's FAQ says add-ons may require a circuit upgrade, typically from 15 A to 20 A or from 20 A to 30 A, but doesn't name models Whether the manual's 7-year labor term is current, since the warranty page gives no length Number and wattage of the far-infrared heaters Which models and components the claimed ETL and CE certification covers Delivery timeline

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.