What you see is what you get. No filler light. Every diode in our devices is a true 650 nm red laser.
When you’re shopping for a hair growth device, you’ll see lots of numbers and technical claims. One of the most important—but often overlooked—details is the wavelength of the light being used. This isn’t just jargon. The wavelength influences whether a device is intended to stimulate hair follicles—or, in some cases, to reduce them.
At Xtrallux, we use only true 650 nm red lasers, because wavelength matters.
650 nm Red Light: Backed by Science
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Proven for hair regrowth. Clinical and laboratory studies show that 650 nm red light can stimulate hair follicles, delay thinning, and support regrowth in people with androgenetic alopecia (pattern hair loss).¹
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The FDA standard. All FDA clearances for at-home hair-growth devices are based on red light in the **635–670 nm range.**² That means the evidence backing these devices comes from red lasers—not other types of light.
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Gentle and targeted. 650 nm light penetrates to the right depth to stimulate follicle cells by improving circulation and boosting cellular energy, without creating damaging heat.
808 nm Infrared: A Different Role in Medicine
Now, let’s talk about 808 nm infrared lasers.
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Commonly used in hair removal. 808 nm diode lasers are frequently FDA-cleared for long-term hair reduction, because they penetrate deeply and can heat the follicle enough to damage its ability to regrow hair.³⁴
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Other medical applications. 808 nm lasers are also cleared for surgical uses (like soft tissue cutting and coagulation), treatment of vascular lesions, and temporary relief of pain and inflammation.⁵⁶⁷
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Not designed for regrowth. While wavelength alone doesn’t guarantee the outcome—factors like pulsing, power, and duration also play a role—the fact that 808 nm is consistently used in hair-removal devices shows that its typical application is very different from the red-light range used in regrowth.
In other words, 650 nm is associated with stimulation, while 808 nm is associated with reduction. That distinction matters when you’re choosing a device.
Why Wavelength Integrity Matters
Some brands inflate their “laser counts” with a mix of wavelengths—some aligned with regrowth, others cleared for completely different purposes. That can make a device look more powerful than it really is, while distracting from what actually drives results.
At Xtrallux, what you see is exactly what you get: every diode is a true 650 nm +/-5 red laser, the same type used in the studies that led to FDA clearance for hair growth.
A Quick Note About LEDs
You’ll also see devices that mix lasers with LEDs and count them together as if they’re the same thing. While the FDA has cleared some hybrid devices, the clinical evidence for hair regrowth comes from red lasers.
We’ll cover the full laser vs LED comparison in another article—but for now, the key takeaway is simple: if you want the same focused, consistent energy used in published studies, you need true red lasers.
The Bottom Line
When it comes to light therapy for hair growth, wavelength tells you a lot about what a device is designed to do.
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650 nm red lasers = stimulation and regrowth.
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808 nm infrared = commonly used for hair removal, surgery, or pain relief—not regrowth.
That’s why Xtrallux commits to one thing only: true 650 nm red lasers in every diode. With us, what you see is what you get—no compromises.
Sources
- Yang K, et al. Hair Growth Promoting Effects of 650 nm Red Light Stimulation on Human Hair Follicles. Ann Dermatol. 2021. PubMed
- Practical Dermatology. Home-Use Laser and Light Devices: Just What the Doctor Ordered. 2011. Link
- DuCharme Dermatology. Laser Hair Removal with BARE 808. Link
- Paasch U, Bodendorf M. Long-term efficacy of linear-scanning 808 nm diode laser for hair removal. Lasers Surg Med. Wiley
- FDA 510(k) Summary: Biolase EZLase (808 nm) for soft tissue surgery. FDA Database
- Kauvar AN. Laser treatment of pigmented lesions. Dermatol Clin. 2002;20(1):67-80. (Discussing vascular & pigmented lesion treatments with diode/KTP wavelengths). PubMed
- Erchonia Laser 510(k): 808 nm for temporary pain relief indications. FDA Database
