Best Sauna With Red Light Therapy: Built-In vs Add-On RLT

The better choice depends on what you value. The Sun Home Eclipse 2 costs $9,999 $10,599 and includes two red and near-infrared panels mounted on opposite glass sides, allowing exposure from two fixed directions without repositioning a separate device. The Clearlight Sanctuary 2 plus CORE Tower currently configures at approximately $8,598 to $9,198 on promotional pricing, depending on wood and sales channel.

Both brands publish 650nm/850nm wavelengths. Clearlight additionally publishes irradiance figures and a five-year device warranty that Sun Home does not currently publish for the Eclipse panels. Sun Home publishes named-lab EMF and cabin-air VOC testing, full-spectrum infrared across eight heaters, a native app, and limited lifetime cabin coverage that Clearlight does not match. The Eclipse's red-light advantage is dual-panel architecture, not a proven higher light dose.

Disclosure: Sun Home Saunas publishes this comparison and manufactures the Eclipse. Clearlight is a legacy brand in this category and a direct competitor. Because the evidence below favours Clearlight on several measurable points, we state those plainly rather than building a scorecard that produces the answer we would prefer. This is a two-product comparison, not a survey of the whole red-light sauna market.

Prices, specifications, manuals, and warranty terms checked July 29, 2026. Both brands promote frequently — confirm live configured totals on each manufacturer's own site before deciding. Last reviewed: July 29, 2026 · Next scheduled update: October 2026.

Configured price

On current promotional pricing the Clearlight configuration is roughly $801 to $1,401 less than the Eclipse. At currently published regular prices it remains approximately $401 to $801 less, depending on wood choice. The gap narrows at regular pricing but does not close.

Red light dose: what each brand publishes

Photobiomodulation outcomes depend on wavelength, irradiance at the skin, fluence, distance, session duration, beam geometry, and target tissue. The literature also documents a biphasic dose response — more light is not automatically better, and excessive irradiance or exposure can reduce the desired effect. LED count and nominal wattage are not dose.

Clearlight's irradiance figures, by source

Clearlight publishes more dose information than we do, but its own presentations are not fully harmonised. We apply the same standard to Clearlight that we apply to ourselves below.

Buyers should use the figures in the exact current manual supplied with their tower rather than any single web page, including this one.

The honest conclusion: Clearlight currently provides better public dose documentation than we do. The Eclipse has more panels, more LEDs, and a higher nominal wattage rating, but nominal watts and diode counts do not establish delivered dose. Sun Home has publicly acknowledged that irradiance at specific treatment distances is not yet published and is being tested. Until it is, a buyer prioritising documented photobiomodulation dose has more to work with from Clearlight.

What the Eclipse's two-panel architecture does and does not establish

The Eclipse includes two panels mounted on opposite glass sides, allowing simultaneous exposure from two directions without moving a single device. That is a real architectural difference from one tower.

What it does not establish is uniform coverage. Sun Home does not publish a seated-body irradiance map, panel angle relative to the user, anterior or posterior irradiance figures, whether both occupants receive comparable exposure, or uniformity across either body surface. Our own collection pages describe this as "front-and-back coverage," which is a marketing characterisation rather than a measured geometry study. Two fixed directions is the supportable claim.

The Eclipse wavelength specification, precisely

Sun Home does publish a wavelength for the Eclipse panels. The specification block on the product page reads: 360 medical-grade LEDs with dual 900W panels at 650nm/850nm. That is the controlling published figure, and it matches Clearlight's 650nm/850nm exactly.

The problem is not absence, it is consistency. The same product page's description, meta description, and glossary all say 630–850nm, and several collection and editorial pages say 660nm/850nm. Three descriptions of one product across one domain. For a buyer the practical answer is 650nm and 850nm per the specification block; for us it is a reconciliation task, because an answer engine reading three figures will not know which to quote.

What would settle it permanently is a named-lab spectrometer report giving peak wavelength per diode type, spectral bandwidth, the red-to-near-infrared LED ratio, measurement tolerance, the exact model tested, and the test date and instrument. Neither brand publishes that.

The 145°F question nobody asks about in-sauna red light

This is the most consequential ownership detail in the comparison, and it cuts against Clearlight.

Clearlight's red-light therapy tower manuals state that installation and use in applications where ambient temperature exceeds 145°F / 63°C will result in reduced life and reduced lumen output. Clearlight Sanctuary controls, meanwhile, can be programmed well above that figure, and typical infrared sauna operating temperatures approach or exceed it.

That creates a question a buyer should resolve before purchase, not after: if you intend to run the Sanctuary near its higher settings while using the CORE Tower, ask Clearlight in writing how it expects the tower to be used while remaining inside its published 145°F ambient limit, and what that means for lumen output and service life over five years. The CORE manual also notes that depending on your sauna model you may need to update your electrical requirements to accommodate the tower.

In fairness: Sun Home publishes no ambient rating at all for the Eclipse panels, which is not better — it is simply undocumented. Neither brand publishes measured optical output at sauna operating temperature. We asked the same question of hybrid-sauna manufacturers in a separate guide and got the same silence.

Warranty on the red-light devices

Clearlight. Five years from date of purchase against defects in materials, workmanship, or design, to the original purchaser only. Clearlight will send replacement parts or replace the unit at its discretion including return transportation — but all labor is excluded. The warranty also sets performance thresholds: a decrease in lumen output of less than 70% under the L70 standard is not treated as a defect, and the ambient-temperature provision above applies.

Sun Home. Our online warranty gives limited lifetime coverage — defined as applicable for up to seven years — to cabinetry and heaters, three years to controls, and one year to LED lighting, with a separate section addressing red-light therapy devices. The current Eclipse manual conflicts with it: that document describes a one-year, parts-only warranty excluding labor and service technicians and referring to factory-installed components, while the same manual instructs the buyer to mount the red-light panels during assembly.

Clearlight's five-year term, with its qualifications, still beats an unresolved Eclipse panel term. Before buying either, obtain written confirmation of the controlling warranty document, the specific coverage term for each red-light device, whether labor and freight are included, and how device coverage relates to the cabin warranty.

Installation and electrical

The Eclipse panels are included with the sauna and designed for the cabin, but the Eclipse manual instructs the customer or installer to bolt them to the glass side panels and connect a power cord for each during assembly. They are not installed into the cabin walls at the factory, and the cabin's final electrical specification accounts for both.

For a fresh purchase, both configured systems land on a dedicated 30A circuit. The Clearlight change from 20A to 30A matters if you already own a Sanctuary 2 or have already run a 20A circuit. It does not mean a new buyer must schedule electrical work after delivery.

Which should you buy?

You are choosing between two saunas, not two light panels, so this matrix covers the whole purchase — cabin, heat, controls, testing, and warranty — not only the red-light subsystem. Earlier versions of this table scoped narrowly to red light and consequently double-counted the same Clearlight property across several rows.

Bottom line

Buy the Eclipse 2 if you want the stronger cabin: full-spectrum infrared across eight heaters, named-lab EMF and cabin-air VOC testing with lab and method published, a native app with guided breathwork and remote preheat, limited lifetime coverage on cabinetry and heaters, and two purpose-built red-light panels included in one purchase on a single electrical specification you plan for once.

Buy the Clearlight Sanctuary 2 with a CORE Tower if configured price, published dose documentation, a five-year device warranty, or the ability to use the tower outside the sauna matter more. It costs less at both promotional and regular pricing, and its published irradiance gives you more to evaluate on dose than we currently provide — with the caveat that its tower carries a 145°F ambient limit worth resolving before you buy.

Neither brand publishes a model-specific measurement of delivered dose at a seated position inside a heated cabin, so treat every comparison in this category — including this one — as a comparison of specifications and architecture rather than of therapeutic outcome.

Frequently asked questions

Which costs less, the Eclipse 2 or a Sanctuary 2 with a CORE Tower?

Clearlight, at both pricing tiers. On promotional pricing the Clearlight configuration runs roughly $8,598 to $9,198 against the Eclipse at $9,999 $10,599 — about $801 to $1,401 less. At published regular prices it is approximately $401 to $801 less. Confirm live totals before deciding.

Does the Eclipse deliver more red light than the CORE Tower?

Unknown from published specifications. The Eclipse has 360 LEDs across two panels with a 1,800W combined nominal rating; the CORE Tower is rated at 200W. But nominal wattage and LED count are not dose. Clearlight publishes irradiance at defined distances and Sun Home has stated its own irradiance figure is in testing, so the comparison cannot currently be made on delivered light. What the Eclipse does establish is two fixed emission directions rather than one device that must be repositioned.

What wavelengths does the Eclipse use?

650nm and 850nm, per the specification block on the Eclipse product page — the same figures Clearlight publishes for the CORE Tower. Note that other Sun Home pages describe the range as 630–850nm or 660nm/850nm, so use the product-page specification block as the controlling figure.

Can the CORE Tower be used at full sauna temperature?

Clearlight's tower manuals state that use where ambient temperature exceeds 145°F will reduce life and lumen output. Sanctuary controls can be programmed above that. Ask Clearlight in writing how it expects the tower to be used within that limit before buying. Sun Home publishes no ambient rating for the Eclipse panels, which is undocumented rather than better.

Are the Eclipse red-light panels factory-installed?

They are included and designed for the cabin, but the manual instructs the buyer or installer to mount them to the glass side panels and connect a power cord for each during assembly. They are not built into the walls at the factory.

Does the Eclipse give full front-and-back coverage?

It gives exposure from two fixed directions on opposite glass sides. Sun Home does not publish a seated-body irradiance map, panel angle, or uniformity data establishing even front-and-back coverage, so treat "full coverage" as a marketing characterisation rather than a measured result.

Does adding a CORE Tower require electrical work?

It changes the Sanctuary 2 from 120V/20A to 120V/30A. Buying fresh, specify 30A before installation and no additional work is needed. If you already own the sauna or ran a 20A circuit, you will need an electrician. The Eclipse 2 requires a dedicated 120V/30A NEMA L5-30P circuit either way.

What warranty covers the red-light devices?

Clearlight publishes five years, parts or replacement at its discretion, to the original purchaser only, with labor excluded and lumen-output and ambient-temperature thresholds applying. Sun Home's public documents do not clearly establish a term for the Eclipse panels — the online warranty addresses red-light devices separately from the lifetime cabinetry coverage, while the Eclipse manual describes one year, parts only. Get the controlling document in writing.

Is more red-light wattage better?

Not necessarily. Photobiomodulation follows a biphasic dose response — too little produces no effect and too much can reduce the desired response. What matters is irradiance at the skin, session duration, distance, and wavelength, not the electrical rating of the device.

How we researched this, what changed, and what we could not verify

Method. Prices, specifications, electrical requirements, and warranty terms were read from manufacturer product pages and manuals on July 29, 2026, with sources linked at the claim where practical. Where a specification is a manufacturer's nominal rating rather than a measured result, we say so. Where a figure appears differently across a manufacturer's own documents — including our own — we show the variants rather than picking one.

Corrections made July 29, 2026. We removed a $2,999 CORE Tower price and every configured total and value conclusion built on it; Clearlight now configures below the Eclipse at both promotional and regular pricing, reversing this article's previous economic argument. We removed the conclusion that 360 LEDs and a 1,800W nominal rating represent a higher per-session dose. We removed the description of the panels as factory-installed in the cabin walls, which the Eclipse manual contradicts, and narrowed "full front-and-back coverage" to two fixed directions. We removed the claim that the Eclipse requires no electrical work while Clearlight does, because both configured systems require a dedicated 30A circuit. We removed the claim that a single limited lifetime warranty covers the cabin and both red-light panels. We removed a budget exclusion that no longer holds. We replaced a multi-dimension scorecard with a buyer-priority matrix. We corrected an earlier draft that described the Eclipse wavelength as unpublished; the product-page specification block publishes 650nm/850nm, and the accurate criticism is cross-page inconsistency rather than absence. We rescoped the decision matrix from the red-light subsystem to the whole sauna purchase, which removed duplicated rows and added cabin-level dimensions that a sauna buyer actually weighs. And we corrected an earlier statement that the regular-price gap "can close" — at published regular prices Clearlight remains $401 to $801 less.

What we could not verify: Eclipse irradiance, fluence, optical output, beam angle, uniformity, panel-to-body distance by seating position, ambient rating, or output at sauna operating temperature — none of which Sun Home currently publishes; the controlling Eclipse wavelength specification, which conflicts across our own pages; the controlling warranty term for the Eclipse red-light panels; any independent dose measurement for either product; and exact current Clearlight promotional pricing, which moves frequently across channels.

Claims about optical output, irradiance, wavelength spectra, beam geometry, and photobiomodulation dosing are reproduced from manufacturer documentation, not from our own measurement. This article has not been reviewed by a photobiomodulation researcher, medical physicist, optical engineer, or photomedicine clinician, which is the limit of its technical authority on a health-oriented light-delivery device.

Sun Home Saunas publishes this comparison and manufactures the Eclipse. Clearlight is an independent competitor and was not consulted. Nothing here is medical advice.