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Rated 4.9 out of 5 stars
233 Reviews

ThermaLight Infrared Bulb

Regular price $95 USD
Regular price $95 USD Sale price $95 USD
ThermaLight Infrared Bulb
Regular price $95 USD
Regular price $95 USD Sale price $95 USD
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SKU: BT00120000N    UPC: 810018190002

Experience infrared therapy the way nature intended with our proprietary ThermaLight® bulbs. We spent years perfecting a spectrum that delivers near, mid, and far infrared, plus red light just like the sun—but with none of the harmful UV. 

The bottom line: you get the best heat and light therapy in less time. Sweat faster, feel better.

  • No harmful UV light
  • No blue light
  • No flicker stress
  • Delivers 2–4x more red and near infrared wavelengths than competitors
  • Mouth-blown stained glass made using ancient techniques

Note: Our stained glass bulbs are handmade and unique, which means they may have slight color variations that in no way affect performance. Each bulb goes through a strict quality control process to ensure your satisfaction.

*Two-year warranty applies to ThermaLight® Bulbs used as intended in SaunaSpace products. For all other uses, warranty is limited to one year. When you make a warranty claim, SaunaSpace may ask for proof of purchase of accompanying SaunaSpace products before processing the claim. 


3.2 oz (91 g)


Bulb diameter: 4.9 in (125 mm)

Stem diameter: 1.7 in (42 mm)

Bulb height: 6.6 in (168 mm)

General specifications

Bulb type: R40 

Socket type: E26

Base type: screw-in

Glass color: dark red

Coating/finish: none

Filament: C-9

Rated life: 5,000 hours

Bulb material: hard glass

Product technology: Incandescent

Glass processing: tempered, annealed

Glass production method: mouth-blown, hand-rolled

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.

Don't know which voltage to select? Learn which is correct for you in our FAQ.

Operating specifications 

Max operating temperature: 570 °F (299 °C)

Intensity: 1400 W/m2 at 1 ft (305 mm)

Lamp fixture: intended for use only in a lamp fixture rated for minimum 250 W*

*use in a lamp fixture not meeting the wattage rating requirement voids the warranty. Learn more about our ThermaLight® warranty.





Thermalight bulb

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.

See How it Works

Reviews and Questions

Rated 4.9 out of 5 stars
Based on 233 reviews
Total 5 star reviews: 220 Total 4 star reviews: 9 Total 3 star reviews: 1 Total 2 star reviews: 1 Total 1 star reviews: 2
98%would recommend this product
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233 reviews
  • DS
    David S.
    Verified Buyer
    I recommend this product
    Benefits I Notice Reduced Screen/Technology Fatigue, Stress Reduction, Detox, Improved Sleep, Improved Mental Health/Mood
    My Favorite Features Quick Sweating, Convenience of Sauna at Home, Ritual for Mindfulness, Nature’s FireLight Spectrum Indoors
    Age 30-39
    Rated 5 out of 5 stars
    3 months ago
    Great Product, Great Company - all you need to know

    They are exactly as advertised. I couldn't be happier with my purchase and how the ThermaLights have performed to date. I believe this light/heat combination is superior to anything else on the market.

  • GB
    Gina B.
    Flag of United States
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 year 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.

  • KF
    Kate F.
    Flag of United States
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    Love the ThermaLight Infrared Bulb

    Love this light bulb, especially in the winter. I use it daily. It’s been helping my skin and my mood! The red light and heat is calming and therapeutic, my dog loves it too!

  • AN
    Adam N.
    Flag of United States
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    Added proton w ThermaLight bulb

    Added proton w ThermaLight bulb to my Faraday set for some extra juice and it didn’t disappoint! Can definitely feel the difference with the new Thermalight bulbs vs the old school ones. Definitely intend to gradually replace older bulbs with the newer ThermaLight ones.

  • AA
    Abdulrahman A.
    Flag of Saudi Arabia
    Verified Buyer
    I recommend this product
    Rated 4 out of 5 stars
    2 years ago
    Nice experience

    Here I sit an hour a day before bed, and you get a very deep sleep, and more muscle relaxation, but you need a closed and small place to sweat, avoid lighting on the head, you may get a headache

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