FireLight Infrared Bulb

Everything. The FireLight® Infrared Therapy Bulb is the light source inside Glow, Hearth, and the FireLight® Sauna. Its tungsten filament and red glass work together to deliver a continuous incandescent spectrum of red and infrared light, combining light exposure with radiant warmth.

It’s a near infrared therapy bulb engineered for both photobiomodulation and radiant heat therapy. Its finely tuned tungsten filament runs at a higher Kelvin than standard heat lamps, producing high-output red and near-infrared wavelengths (600–1000nm), ideal for cellular repair, muscle recovery, detox, and mitochondrial rejuvenation.

The bulb is made from hard quartz glass, not soft glass. It’s red-stained, not coated, so there are no chemicals, dyes, silicone, or Teflon. Just clean, pure, high-output light.

Each bulb is splash-tested while operating (yes, literally sprayed with cold water while hot), and tested again at our Missouri factory before it ships.

We publish independent spectral measurements so you can see the actual distribution of its output. Explore the measured FireLight Spectrum, along with the laboratory’s equipment, distance, and testing conditions.

Plenty, by design. This 250W bulb has a filament temperature around 2400K, with surface temperatures reaching 300ºF (150ºC). It delivers deep, radiant heat fast, perfect for sauna therapy or targeted red light sessions.

Glow and Hearth include protective guards for safety. Just avoid touching the glass when hot.

Each bulb is rated at 250 watts. SGS measured 100 production bulbs at the nominal 120V test setting and recorded an average consumption of 244.23 watts, with individual readings from 237.16 to 252.89 watts. These measurements show how closely the tested bulbs matched their rated electrical consumption. Explore the independent power-consumption results.

We don’t recommend looking directly at the filament inside the bulb. It’s bright, and not meant for eye-level focus.

That said, many users keep their eyes open while reading or working near the light (especially with the Glow or Hearth). Others close their eyes or glance away. The benefits still happen; photobiomodulation doesn’t require eye contact.

Do what feels right for your body, and never force direct eye contact if it feels uncomfortable.

We don’t recommend it.

The FireLight® Bulb runs at 250 watts and gets very hot: hot enough to require a properly shielded, grounded, and ventilated fixture. Most regular fixtures simply aren’t built for this power level. Without the right materials and safety features, you risk burns, EMF exposure, or even fire.

Our handcrafted fixtures, Glow and Hearth Sauna Panel used in our FireLight® Sauna, use ceramic sockets, grounded stainless guards, and EMF-safe designs, developed over years of R&D. For safe, low-EMF near infrared therapy, pair your bulb with its proper SaunaSpace home.

It’s simple. If the bulb turns on, you’re getting full power. Unlike LEDs, it won’t slowly dim or degrade. When it’s time, the bulb will just stop working, no guesswork, no decline.

Each bulb is rated for 5,000 hours, typically lasting 5 to 10 years based on use. It shines at full strength until the moment it stops: no dimming, just a clean burnout.

If your bulb came with a SaunaSpace product, it’s covered by our five-year warranty. After that, customers receive an exclusive replacement price of $95.

If purchased alone, it’s still covered under standard use: five years for SaunaSpace use, one year otherwise.

The FireLight® bulb is an electrical light source, and the fixture matters when evaluating emissions. Glow and Hearth incorporate grounding and shielding into their designs.

SGS tested Glow, Hearth Trio, and Hearth Quartet with their bulbs illuminated. Magnetic-field readings stayed close to the laboratory background, and all three tested products met IEC/EN 62233:2008 requirements. Explore the magnetic-field measurements. 

These results apply to the tested SaunaSpace fixtures, rather than a bare bulb installed in another lamp.

This setup blocks electric fields at the source, delivering powerful red and near infrared therapy with low EMF output. 

Our bulb is designed to be used with our Glow and Hearth (in and out of the FireLight® Sauna) to prevent any EMF from the bulb from influencing the user.

Absolutely. The Glow and Hearth are perfect for standalone red light therapy, ideal for desks, bedsides, or home wellness zones.

You’ll get the full photobiomodulation benefits, with gentle warmth but without intense sweating.

Yes. Unlike most LED panels, which narrow their output, the FireLight® Bulb offers a broad spectrum of red and near-infrared wavelengths. It’s ideal for whole-body rejuvenation, detox, and mitochondrial support.

Try not to. The red-stained hard quartz glass is more durable than soft glass, but oils from your skin can create hot spots on the bulb over time. If you accidentally touch it, wipe it down with a clean microfiber cloth and a little rubbing alcohol before using.

Each bulb is splash-tested while hot to reveal microscopic flaws. It’s built to withstand brief, accidental splashes, but not designed for steam or wet rooms. Avoid moisture exposure during use.

Yes, but we don’t recommend it. The FireLight® Bulb is designed to run at full power for optimal therapeutic output. Using a dimmer can affect the spectrum, reduce the therapeutic effect.

For gentler sauna sessions, just turn one or more switches off so you are using less bulbs. When using the Glow and Hearth outside the sauna, increase your distance from the light.

Yes, with supervision. The light itself is safe, and many pets are naturally drawn to the warmth. Just make sure no one touches the bulb while it’s hot.

Always use the included protective guards with Glow and Hearth, and keep an eye on curious hands or paws.

Every FireLight® Bulb is tested not once, but twice, first at our partner facility, and again at our Missouri headquarters.

Each bulb is powered on and splash-tested while hot to ensure it can withstand thermal shock, an uncommon level of stress-testing that reveals microscopic flaws in the glass. Only the strongest, most consistent bulbs pass. Once they arrive at our facility, we inspect and test them again for visual quality, performance, and stability before they're packed for shipment.

It’s part of what makes the FireLight® Bulb different: not just the spectrum, but the standards behind the glow.