SaunaSpace FireLight Infrared Therapy Bulb - Close Up

FireLight Infrared Bulb

$204 $240

Born from over a decade of research and development, the FireLight® Bulb is the heartbeat of everything we offer. It delivers optimized red and infrared light—concentrated in the near-infrared range and extending into mid and far—for unmatched light and heat therapy. With no flicker, and no blue light, this hand-blown bulb supports detox, circulation, cellular repair, and calm. Elemental light, biologically tuned for deep transformation.

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120V USA

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SaunaSpace FireLight Infrared Therapy Bulb - Close Up

FireLight Infrared Bulb

$204 $240
Order Processing: 1-3 business days
$204 $240

Specifications

General Specifications

Bulb type: R40 

Socket type: E26

Base type: screw-in

Glass color: dark red

Coating/finish: none

Filament: C-9

Filament operating temperature: 2400K

Rated life: 5,000 hours

Product technology: incandescent

Glass processing: tempered, annealed

Glass production method: stained and blown

Dimensions

Bulb diameter: 4.9 in (125 mm)

Stem diameter: 1.7 in (42 mm)

Bulb height: 6.6 in (168 mm)

Materials

Bulb material: hard glass

Cap-base material: brass

Electrical Info

Wattage: 250 W

Input voltage and frequency: 120V at 50–60 Hz1, 240 V at 50–60Hz2

1120V is used in USA, Canada, Mexico, Japan and other select countries.

2240V is used in Europe, Asia, South America, and Australia/New Zealand, and most of the rest of the world.

No One Does Infrared Like Us

We've spent years crafting the perfect hand-blown sauna bulb. We mimic the best of the sun—with none of the harmful UV—to create full-spectrum infrared therapy that is truly one of a kind.

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Silhouette of woman walking toward red spotlight background in dimly lit room
Close-up of Hearth Infrared Sauna Panel with lights on
Silhouette of woman with red light on eyes against background of violet light.
Woman using SaunaSpace Exfoliating Brush on her thigh under red light, inside FireLight Infrared Sauna
Man ballet dancing with and holding woman in dimly lit room with red light cast upon them

293 Reviews from Happy Customers

4.9
Rated 4.9 out of 5 stars
Based on 293 reviews
Total 5 star reviews: 275 Total 4 star reviews: 11 Total 3 star reviews: 3 Total 2 star reviews: 2 Total 1 star reviews: 2
98%would recommend this product
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293 reviews
  • AK Profile picture for Andrea K.
    Andrea K.
    Verified Buyer
    I recommend this product
    Benefits I Notice Pain Reduction, Less Inflammation, Reduced Screen/Technology Fatigue, Radiant Skin, Detox
    My Favorite Features Nature’s FireLight Spectrum Indoors, Convenience of Sauna at Home, Combining Light & Heat Therapy, Portability, Grounding
    Age 40-49
    Rated 5 out of 5 stars
    1 year ago
    Significant reduction in inflammation!

    My father has recently been diagnosed with a rare genetic mutation called Vexas, which causes severe inflammation of the cartilage throughout the body, particularly in the nose and ears.

    After only 10 minutes of exposure to the sauna space infrared bulb, there was a significant reduction in inflammation. Regular use has also been helping to reduce the pain and redness.

    I also have a sauna space bulb and look forward to using it daily to ease aches and pains, rejuvenate my skin, reduce screen fatigue, and simply enjoy basking under the glow.

    QualityRated 2.0 on a scale of minus 2 to 2
    Ease of SetupRated 2.0 on a scale of minus 2 to 2
    I Use ItRated 2.0 on a scale of minus 2 to 2
    ExpectationsRated 2.0 on a scale of minus 2 to 2
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    Was this helpful?
  • GB
    Gina B.
    Flag of United States
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 years ago
    Bulb & Bodacious

    I've had my Sauna Space for about 2 years now and love it and use it every day. The bulb lasted a long time and I replaced it for the first time recently. Came quickly, beautifully packed and super easy to install. I'm so happy I bought this product and would like one day to make the investment in a larger system. I've recommended it to others. Feels so good! Thank you for this really nice company that makes lovely products.

    Featured
    Was this helpful?
  • JS
    Jeff S.
    Verified Buyer
    I recommend this product
    Benefits I Notice Pain Reduction, Improved Mental Health/Mood, Immune Support, Less Inflammation, Stress Reduction
    My Favorite Features Comfortable Air Temperature, USA-Handcrafted Quality, Combining Light & Heat Therapy, Convenience of Sauna at Home, Nature’s FireLight Spectrum Indoors
    Age 60-69
    Rated 5 out of 5 stars
    2 months ago
    Red light therapy room

    I actually took one of my walk-in closets and converted it into a red light therapy room made out of red cedar with a 2 inch thick raw edge piece of maple w/ 4 of your infrared bulbs .. I love it! I’ve been using it every day, in the morning for the last three months since completion.

    QualityRated 2.0 on a scale of minus 2 to 2
    Ease of SetupRated 1.0 on a scale of minus 2 to 2
    I Use ItRated 2.0 on a scale of minus 2 to 2
    ExpectationsRated 1.0 on a scale of minus 2 to 2
    Was this helpful?
  • E
    Elise
    Verified Buyer
    Rated 3 out of 5 stars
    6 months ago
    Not the same as their older “Thermalight”

    I ordered this without reading the fine print, just assuming it was the same as the prior bulb that I had purchased from them because the price was about the same. I loved the prior bulb, which was a very deep red handblown glass. Honestly, I felt like the price was worth it for that bulb, but I’m not certain that it’s worth it for this one. It seems similar to other others I’ve seen on the market for less. It still seemed like a good bulb, but less than a month after buying it, I knocked the lamp over and the filament is now broken (my fault) so I need to replace and I’m looking elsewhere.

    QualityRated 0.0 on a scale of minus 2 to 2
    Ease of SetupRated 0.0 on a scale of minus 2 to 2
    I Use ItRated 0.0 on a scale of minus 2 to 2
    ExpectationsRated -1.0 on a scale of minus 2 to 2
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    SaunaSpace
    5 months ago

    Thank you for your honest feedback. We’re sorry to hear that the new bulb didn’t meet your expectations, and we appreciate the opportunity to clarify a few things regarding the changes.

    As you mentioned, we switched to a new bulb design—the FireLight® Bulb—in November 2023. While it may look different from the previous ThermaLight Bulb, we assure you that it offers an enhanced experience. The new design uses a slightly lighter red hard quartz glass, which allows more irradiance to pass through, providing a more powerful light and heat therapy.

    Our FireLight® Infrared Bulb delivers 2x the irradiance in the light therapy (photobiomodulation) band of red and near-infrared light (600nm - 1000nm) and also provides more heating. This makes the bulb not only more effective for light therapy but also offers a stronger therapeutic experience.

    Thanks again for sharing your thoughts with us, and we hope you'll consider giving the FireLight® bulb another chance!

  • KC
    kathleen c.
    Verified Buyer
    I recommend this product
    Age 50-59
    Rated 5 out of 5 stars
    8 months ago
    first purchase

    i cannot afford a whole set-up right now, so i purchased a single bulb. i am enjoying it ( i believe i have seen an improvement in inflammation), so are my senior pups!

    QualityRated 2.0 on a scale of minus 2 to 2
    Ease of SetupRated 2.0 on a scale of minus 2 to 2
    I Use ItRated 0.0 on a scale of minus 2 to 2
    ExpectationsRated 0.0 on a scale of minus 2 to 2
    Was this helpful?
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The FireLight Bulb Q&A

What's special about our FireLight® Bulb?

Our proprietary FireLight® Infrared Bulb is the result of years of thoughtful testing and careful refinement, designed to be a big step up from the traditional incandescent bulb. It’s what powers every product we make, and it's built for serious light and heat therapy.
It has a specially tuned filament that runs at a higher Kelvin temperature. This shifts the emitted spectrum into higher frequency, so there's a higher percentage of 600-1000nm PBM wavelengths. So it’s more effective for both humans and animals than a regular heat lamp. And the glass? It’s not your average bulb glass. The glass is red-stained, hard quartz glass, unlike most bulbs which use cheaper soft glass and are not stained but instead are coated red or dyed red. That means no chemicals, no silicone, no teflon, and no mystery coatings. Just pure, clean light.
Each bulb is splash-tested while operating—yes, we literally splash cold water on it—to make sure there are no hidden flaws. Then, every bulb is tested again at our SaunaSpace factory before it reaches you.

How long does the FireLight® Bulb last?

Our signature FireLight® Infrared Bulb is manufacturer rated for 5000 hours of burn time and are covered by our warranty. Most customers receive 2-4 years of usage. Some users experience more time, some less. The bulbs will require replacement eventually. Incandescent bulbs are an analog technology, unlike LED. If your bulb turns on- you receive the same power and irradiance output every time, for the entire life of the bulb. If it does not turn on- it needs to be tested and possibly replaced! In contrast, LEDs will slowly dim (lose light therapy power) over time, becoming more and more unreliable.

How much heat does the FireLight® Bulb emit?

The FireLight® Bulb is 250W, with a filament temperature around 2400K. While the bulb itself gets quite hot, the glass temperature can exceed 300°F (about 150°C). For safety, our Glow and Hearth have protective guards designed to ensure you don't come into direct contact with the operating bulb, preventing any risk of burns. When used at the usage range from your body, it will effectively heat the local area, making it great for sauna or targeted use.

Can I stare at the FireLight® Bulb with my eyes open?

We suggest not to stare directly into the filament of the bulb. Most of our customers gaze around the Glow or Hearth™ with their eyes open or close their eyes while facing the bulbs during their session. Many will do both.

Can I use the FireLight® Bulb in my own fixture?

The FireLight® Bulb performs best when used with our Glow, Hearth™, and FireLight® Sauna. Our Hearth™ and Glow are designed for both safety and performance, featuring protective bulb guards to protect against burns and eliminate EMF exposure.
Each panel is handmade using heat-safe, untreated natural materials, and includes UL-listed wiring, sockets, and junctions. Every unit is fully shielded for EMF mitigation and backed by a comprehensive warranty.
Unlike mass-produced or brooder-style lamps, our panels offer:

  • Built-in EMF grounding
  • Burn protection through heat shields
  • Certified safe components
  • Full 5 year product warranty


Using the FireLight® Bulb not in a Glow or Hearth™
The FireLight® bulb must be used in a fixture rated for 250 watts. Read our detailed guidance on compatible fixtures and safe usage.

read more

Discover Our Full Spectrum of Products

Models FireLight Infrared Sauna - Classic (4 bulbs) in Natural Color with lights on and Sauna Stool insideFireLight Sauna Hearth Quartet Infrared Sauna Panel with lights onFireLight Hearth Glow Infrared Therapy Light tilted up with light on and sitting on included basswood baseFireLight Glow
Starting Price $4,995 Trio: $1,495
Quartet: $1,995		 $695
Dimensions 52in, 63in, 52in Trio: 23.75in, 15.5 in, 9 in
Quartet: 23.75in, 23.5 in, 9 in		 13.5in, 7.5in, 9in
Weight 44.9 lb (20.6 kg) Trio: 7 lb (3.2 kg)
Quartet: 11.4 lb (5.2 kg)		 3.6 lb (1.6 kg)
Coverage Full Full Targeted
Session Time Classic (4 bulb): 20-30 min 
SuperSauna (7 bulb) 15 min

20-30 min

Indirect Use: Unlimited

10 min on Head/Neck
10-45 min Rest of Body

Indirect Use: Unlimited
EMF-Shielded Tech ✓ ✓ ✓
Grounding Mat ✓ N/A N/A
EMF-Blocking Enclosure ✓ N/A N/A
Warranty 10 Years 10 Years 10 Years
Portable ✓ ✓ ✓
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The FireLight® Infrared Bulb powers the healing experience inside every SaunaSpace Glow and Hearth unit. It delivers a spectrum of red and near-infrared light designed to support detoxification, cellular repair, and nervous system regulation. Each bulb is engineered for spectral precision, thermal consistency, and safe use within SaunaSpace products.

Unlike LED red light devices, which emit narrow, flickering wavelengths, the FireLight® produces a continuous, biologically aligned spectrum without EMFs or digital interference. The result is a calming, radiant light that works with the body’s natural rhythms.

If you're beginning your light therapy journey, our SaunaSpace 101 guide offers a clear introduction to how light and heat support healing.

For a detailed look at how FireLight compares to conventional LED panels, explore our deep dive into red light therapy versus FireLight technology and learn what makes this spectrum so uniquely effective.