Is the Premier IS-1 full spectrum?

No. It is the far-only, no-frills entry with no separate near-infrared emitter, so in our scoring it is scored as far-infrared rather than full spectrum. Choose it if verified low EMF, not near-infrared, is your priority.

Is the Premier's EMF verified at the seat?

No. The evidence is Clearlight-commissioned Vitatech tests of bare heater panels: a 2015 report found peaks of 0.12 to 0.36 mG at 2 inches, and a 2016 report found readings below 0.5 mG that fall to 0.0 mG at 3 to 4 feet. Those are documented low heater-level readings, which we credit in part, but they are not a seated in-cabin reading and the lab was hired by Clearlight, so the EMF dimension stays capped.

Infrared sauna · cabin

Clearlight Premier IS-1

Name: Clearlight Premier IS-1
Brand: Clearlight

A far-only, no-frills cabin from a brand that publishes Vitatech tests it commissioned of its bare heater panels (peaks of 0.12 to 0.36 mG at 2 inches) and markets ELF cancellation, though no seated in-cabin reading is published and no independent measurement has confirmed it.

By the RecoveryScored editorial team · Reviewed 2026-05-31

5.7

Limited

Composite (0-10), sauna-v1.0

Confidence: Verified

Bottom line

In our scoring, Clearlight Premier IS-1 earns 5.7 out of 10 (Limited). Its 0.36 mG figure is measured at the heater rather than where you sit, so we found no independent reading at the seated position. It rates highest on heat & coverage (10.0/10). This is informational only, not medical advice.

Our take

Clearlight Premier IS-1 lands in our lowest band, at 5.7 out of 10. It is strongest on Heat & Coverage (10.0/10) and weakest on Verified EMF (2.0/10). Key flag: A named third-party lab measured a low figure, but not at the seated body position (read at the heater, or the seat is contested), so the low-EMF claim is not yet verified where you sit. Credited in part for the documented testing; the dimension stays capped until a seated figure is published.

This sauna publishes a named third-party report with a low figure, but not at the seated body position, so it earns partial - capped - EMF credit rather than full. EMF is our heaviest dimension, so an unverified claim alone can hold a sauna in a lower band. Read this score as "the headline EMF claim is not proven at the seat", not "bad sauna" - the build, heat, and value dimensions below tell that part of the story.

Flags

· A named third-party lab measured a low figure, but not at the seated body position (read at the heater, or the seat is contested), so the low-EMF claim is not yet verified where you sit. Credited in part for the documented testing; the dimension stays capped until a seated figure is published.

By the numbers

Type: cabin (1-person)
Spectrum: far-infrared
Verified EMF: 0.36 mG, but not at the seated position
Heaters: 6 x carbon-ceramic hybrid (True Wave) + floor heater
Max temperature: 140 F
Wood: Basswood
Electrical-safety listing: ETL (Intertek), brand-stated
Warranty: lifetime
Price: $5,299

Strengths

+ Heat & Coverage: 10.0/10
+ Safety & Build: 9.0/10

Watch-outs

- Verified EMF: 2.0/10
- A named third-party lab measured a low figure, but not at the seated body position (read at the heater, or the seat is contested), so the low-EMF claim is not yet verified where you sit. Credited in part for the documented testing; the dimension stays capped until a seated figure is published.

Who it is for

· Buyers who want a fixed cabin with an electrical-safety listing

Who should skip it

· Anyone buying specifically for low EMF - the claim here is not verified at the seated body position

How it scored

Verified EMF

2.0/10 · 30%

A low magnetic-field (mG) figure measured at the seated body position by a named third-party lab. A figure measured at the heater, an unsourced number, or a bare low-EMF label is not a usable spec.

+2Third-party report, low figure, but not at the seat B0.36 mG, named lab, position not the seat - A named lab measured a low figure, which is more than a bare claim, but not where you actually sit, where the field can read higher. Credited in part and capped until a seated figure exists.

Spectrum disclosure

6.0/10 · 20%

What the heaters actually deliver. Full spectrum is credited only with a separate near-infrared emitter; far-infrared panels alone are scored as far-infrared.

+6Far-infrared (the most-studied band) Bfar-infrared carbon/ceramic - Far-infrared is the band behind most sauna sweat and cardiovascular research. Honest about what it is.

Heat & Coverage

10.0/10 · 15%

Heater count and placement that surround the body (including a floor or foot heater), and the temperature reached.

+4Surrounds the body B6 heaters - Six or more heaters across the walls give even coverage rather than one hot spot.
+3Floor or foot heater Bfloor heater - A floor or foot heater warms the hardest area to heat, a sign of real surround design.
+3Reaches full sauna temperature B140 F - Reaches the 140 F range expected of a cabin sauna.

Value

5.0/10 · 20%

Price against the median for its type (blanket, tent, or cabin).

+5Price vs class median A$5,299 (below class median) - Price scored against the median for its type. Class median about $5,500.

Safety & Build

9.0/10 · 15%

Electrical-safety listing (UL/ETL), recall history, warranty, and materials.

+5UL/ETL electrical-safety listed AETL/UL - Carries an electrical-safety listing, important for a high-wattage heater you sit beside.
+3Long warranty B99-year - Five-year or longer warranty.
+1Cabin wood disclosed CBasswood - The cabin wood is disclosed.

What to know before buying

· Clearlight publishes Vitatech tests it commissioned of bare heater panels (peaks of 0.12 to 0.36 mG at 2 inches, readings falling to 0.0 mG at 3 to 4 feet in a 2016 test) and markets cancelling both EMF and ELF; no seated in-cabin reading is published.
· This is the far-only, no-frills entry; there is no near-infrared, so it is not full spectrum.
· Carbon-ceramic hybrid heaters across the walls with calf and floor coverage, and an ETL listing.
· Lifetime residential warranty, well above the category norm.
· If you want far-infrared with a lifetime warranty and do not need near-infrared, this is a solid pick; just know its EMF is not verified at the seat.

FAQ

Is the Premier IS-1 full spectrum?: No. It is the far-only, no-frills entry with no separate near-infrared emitter, so in our scoring it is scored as far-infrared rather than full spectrum. Choose it if verified low EMF, not near-infrared, is your priority.
Is the Premier's EMF verified at the seat?: No. The evidence is Clearlight-commissioned Vitatech tests of bare heater panels: a 2015 report found peaks of 0.12 to 0.36 mG at 2 inches, and a 2016 report found readings below 0.5 mG that fall to 0.0 mG at 3 to 4 feet. Those are documented low heater-level readings, which we credit in part, but they are not a seated in-cabin reading and the lab was hired by Clearlight, so the EMF dimension stays capped.

Compared head-to-head

Last reviewed 2026-05-31. Scored under sauna-v1.0. See the methodology. Informational only, not medical advice.