Head to head
Sunlighten Signature Far Infrared vs Sunlighten Solo System (portable)
$5,099 against $2,099. Here is where the $3,000 difference actually goes.
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Higher lab score
Sunlighten
Signature Far Infrared
$5,099
8.2 / 10
Apartment and spare-room installs where 240V is impossible
Sunlighten
Solo System (portable)
$2,099
7.8 / 10
Renters, small apartments, and anyone testing whether they will actually use a sauna
Specifications side by side
| Spec | Sunlighten Signature Far Infrared | Sunlighten Solo System (portable) |
|---|---|---|
| Price | $5,099 | $2,099 |
| Lab score | 8.2 | 7.8 |
| Heat type | Far infrared | Far infrared |
| Electrical | 120V / dedicated 20A | Standard 120V |
| Warranty | 7 years | 7 years |
| Footprint | 1–2 person cabin | — |
| Form | — | Lay-down soft shell |
The verdict
Sunlighten Signature Far Infrared takes the higher score here. Plugs into a normal wall outlet on a dedicated 20A circuit. That single fact removes the $800–1,500 electrician line item that kills most indoor sauna plans.
The counter-argument for the Sunlighten Solo System (portable) is straightforward: it costs $3,000 less. Packs away under a bed. The compromise is real — you sweat lying down with your head outside — but it is the only sauna on this list a renter can own.
Put plainly — if your constraint is budget, take the Solo System (portable) and put the $3,000 toward installation, which is the line item most first-time buyers underestimate. If your constraint is that you want to buy once, the Signature Far Infrared is the one you will not be replacing.
What each one is good at
Sunlighten Signature Far Infrared
Strengths
- 120V operation on a standard dedicated circuit — no panel work
- Far infrared only, which is all most users actually use
- Smaller footprint fits a spare bedroom or large closet
Compromises
- Far infrared only — no near-infrared or red light
- Lower maximum temperature than the Amplify
- Basswood is functional but plain next to cedar
Sunlighten Solo System (portable)
Strengths
- Plugs into any standard outlet with no electrical work at all
- Stores flat when not in use
- Cheapest route to consistent infrared sessions at home
Compromises
- Head stays outside the unit — no facial or respiratory heat
- Not a social or ritual experience
- Soft-shell durability is well below a cabin
Prices captured September 2026 from manufacturer and retailer pages and subject to frequent promotion. Confirm before buying. See our testing method for how lab scores are assigned.