Amplify cabins combine Sunlighten's SoloCarbon far-infrared heaters with halogen full-spectrum heaters. Sunlighten says the line reaches up to 170°F, helped by thick insulation, double-pane glass doors and larger heater panels, and that it heats up faster than its other collections. Sunlighten also says the Amplify line is third-party verified at under 1 milligauss of EMF.
Amplify RED is the same cabin with red and near-infrared light panels built into the walls, which Sunlighten calls photobiomodulation. Every Amplify RED needs a 240V circuit, even the two-person size. Sunlighten's claims about specific wavelengths are its own; it does not publish the panels' wavelengths or output on the store pages we checked.
See the Amplify and Amplify RED at Sunlighten (opens in a new tab) All Sunlighten prices Sunlighten review
Amplify and Amplify RED at a glance
- Infrared
- Far infrared + halogen full spectrum; RED adds red/near-infrared panels
- Max temperature
- Up to 170°F (Sunlighten)
- Sizes
- 2 to 4 people
- Power
- Amplify II on 120V 20A; Amplify III, IV and every RED on 240V 20A
- Finishes
- Basswood, eucalyptus or Obsidian (black), by size
Sizes and specs
- Amplify II (50.9 x 45.9 in) seats two with 5 far-infrared and 3 full-spectrum heaters on a 120V 20A circuit. Basswood weighs 456 lb, eucalyptus 541 lb.
- Amplify III (62.3 in wide) seats three with 7 far-infrared and 3 full-spectrum heaters on 240V, at 3,280W.
- Amplify IV (80.4 x 56.2 in, 921 lb) seats four with 8 far-infrared and 4 full-spectrum heaters, 3,900W on 240V, and a bench that reclines or lifts out.
- Amplify RED II, III and IV add 4, 5 and 8 red/near-infrared panels to the same footprints, at 2,620W, 3,465W and 4,140W, all on 240V.
| Model | Type | Seats | Exterior (W × D × H) | Power | Heat |
|---|---|---|---|---|---|
| Amplify II (opens in a new tab) | Full-spectrum infrared Cabin, indoor | 2 | 50.9 × 45.9 × 77.7 in | 120V 20A dedicated outlet NEMA 5-20, 2,270W | 5 far-infrared + 3 full-spectrum heaters Up to 170°F |
| Amplify III (opens in a new tab) | Full-spectrum infrared Cabin, indoor | 3 | 62.3 × 45.9 × 77.7 in | 240V 20A dedicated outlet NEMA 6-20, 3,280W | 7 far-infrared + 3 full-spectrum heaters Up to 170°F |
| Amplify IV (opens in a new tab) | Full-spectrum infrared Cabin, indoor | 4 | 80.4 × 56.2 × 77.7 in | 240V 20A dedicated outlet NEMA 6-20, 3,900W | 8 far-infrared + 4 full-spectrum heaters Up to 170°F |
| Amplify RED II (opens in a new tab) | Full-spectrum infrared Cabin, indoor | 2 | 50.9 × 45.9 × 77.7 in | 240V 20A dedicated outlet NEMA 6-20, 2,620W | 4 far-infrared + 3 full-spectrum heaters, 4 red/near-infrared panels Up to 170°F |
| Amplify RED III (opens in a new tab) | Full-spectrum infrared Cabin, indoor | 3 | 62.3 × 45.9 × 77.7 in | 240V 20A dedicated outlet NEMA 6-20, 3,465W | 7 far-infrared + 3 full-spectrum heaters, 5 red/near-infrared panels Up to 170°F |
| Amplify RED IV (opens in a new tab) | Full-spectrum infrared Cabin, indoor | 4 | 80.4 × 56.2 × 77.7 in | 240V 20A dedicated outlet NEMA 6-20, 4,140W | 8 far-infrared + 4 full-spectrum heaters, 8 red/near-infrared panels Up to 170°F |
Specs as each brand publishes them, checked October 2026. "Not stated" and "See brand" mean the product page does not give that figure. Models change: confirm size, wiring and price on the brand's page before ordering.
Amplify and Amplify RED prices
Prices as listed on Sunlighten's US online store on October 9, 2026, by finish. See every Sunlighten price on one page.
| Model | Finish | Seats | Power | Store price | Regular price |
|---|---|---|---|---|---|
| Amplify II (opens in a new tab) | Basswood | 2 | 120V 20A dedicated outlet | $5,799 | $6,699 |
| Amplify II (opens in a new tab) | Eucalyptus | 2 | 120V 20A dedicated outlet | $5,999 | $6,899 |
| Amplify II (opens in a new tab) | Obsidian (black exterior) | 2 | 120V 20A dedicated outlet | $5,999 | $6,899 |
| Amplify III (opens in a new tab) | Basswood | 3 | 240V 20A dedicated outlet | $6,799 | $7,899 |
| Amplify III (opens in a new tab) | Eucalyptus | 3 | 240V 20A dedicated outlet | $6,999 | $8,099 |
| Amplify III (opens in a new tab) | Obsidian (black exterior) | 3 | 240V 20A dedicated outlet | $6,999 | $8,099 |
| Amplify IV (opens in a new tab) | Eucalyptus | 4 | 240V 20A dedicated outlet | $8,999 | $10,399 |
| Amplify RED II (opens in a new tab) | Eucalyptus | 2 | 240V 20A dedicated outlet | $7,699 | $8,899 |
| Amplify RED III (opens in a new tab) | Eucalyptus | 3 | 240V 20A dedicated outlet | $8,599 Not available online on October 9, 2026 | $9,899 |
| Amplify RED IV (opens in a new tab) | Eucalyptus | 4 | 240V 20A dedicated outlet | $10,299 Not available online on October 9, 2026 | $11,899 |
Prices from the Sunlighten US online store (shop-us.sunlighten.com), checked October 9, 2026. "Regular price" is the store's compare-at price; the gap is a promotion and changes often. Checkout discounts, shipping offers and sales tax can change the total. Confirm the price on Sunlighten's site before you order.
Add-on packages
Bundles of linens, cushions, backrests and cleaning supplies, sized to the cabin. The Ultimate tiers add Sunlighten's handheld light-therapy device, and Ultimate Radiance adds its red light therapy mask.
| Package | For | Store price | Regular price |
|---|---|---|---|
| Comfort | Signature/Amplify III (3 Person) | $549 Not available online | $649 |
| Essentials | Any cabin | $299 | $349 |
| Comfort | Signature/Amplify IV (4 Person) | $849 | $999 |
| Comfort | Signature I (1 Person) | $499 | $599 |
| Comfort | Signature/Amplify II (2 Person) | $499 | $599 |
| Ultimate Radiance | Signature I (1 Person) | $1,099 | $1,199 |
| Ultimate Radiance | Signature Amplify III (3 Person) | $1,199 Not available online | $1,299 |
| Ultimate Radiance | Signature Amplify IV (4 Person) | $1,399 | $1,499 |
| Ultimate Radiance | Signature/Amplify II (2 Person) | $1,099 | $1,199 |
| Ultimate Rejuvenation | Signature I (1 Person) | $999 | $1,099 |
| Ultimate Rejuvenation | Signature/Amplify II (2 Person) | $999 | $1,099 |
| Ultimate Rejuvenation | Signature/Amplify IV (4 Person) | $1,399 | $1,499 |
| Ultimate Rejuvenation | Signature/Amplify III (3 Person) | $1,099 Not available online | $1,199 |
From Sunlighten's US online store, checked October 9, 2026.
What it costs to run
Rated draw runs from 2,270W (Amplify II) to 4,140W (Amplify RED IV). At the July 2026 U.S. residential average of 18.31¢/kWh (EIA), an hour at full draw costs about $0.42 to $0.76.
Real sessions usually cost less, because the heaters cycle once the cabin is warm, but warm-up time adds to it. Put your own rate into the running-cost calculator.
Before you order
- Only Amplify II runs on 120V. Plan a 240V 20A circuit with a NEMA 6-20 outlet for Amplify III, IV and every Amplify RED.
- The Amplify III Obsidian store page says 120V, while the basswood and eucalyptus Amplify III pages list 240V and a 6-20 outlet. Confirm with Sunlighten before wiring.
- Store pages list current "V2" versions: Amplify IV shows 8 far-infrared heaters, where Sunlighten's older product page lists 4. Check the spec sheet for the exact unit you order.
- The 170°F figure is Sunlighten's maximum "under appropriate conditions". It is still cooler than a traditional Finnish sauna, which typically runs 150 to 195°F with steam.
Delivery, assembly, returns and warranty are the same across Sunlighten's range; they are covered in our Sunlighten review. We have not tested Sunlighten saunas and do not rate them. Specs come from Sunlighten's product pages and US store; confirm current specs and prices on Sunlighten's site (opens in a new tab).
Other Sunlighten collections
- Signature: The Signature is Sunlighten's simplest cabin: far infrared only, one button to start, and the lowest cabin prices in its range.
- mPulse: mPulse is Sunlighten's flagship: red, near, mid and far infrared controlled separately, preset programs, a built-in tablet and an app.
- Solo System: The Solo is Sunlighten's no-room-for-a-cabin option: you lie on a heated pad under two sliding domes, head outside, and it folds away.
Frequently asked questions
How hot does a Sunlighten Amplify get?
Sunlighten says up to 170°F. That is high for an infrared cabin, where 120 to 150°F is more typical.
What does Amplify RED add?
Red and near-infrared light panels built into the walls: 4 in the two-person, 5 in the three-person and 8 in the four-person model. It needs 240V at every size and lists for more than the matching Amplify.
Is the Amplify basswood or eucalyptus cheaper?
Basswood. On Sunlighten's US store it lists $200 below eucalyptus for Amplify II and III (checked October 9, 2026). Amplify IV and Amplify RED are listed in eucalyptus only.
