Laser vs. LED Light Therapy: What's the Difference?

If you've started looking into at-home light therapy, you've probably noticed two words everywhere: laser and LED. One brand says lasers are stronger. Another says LEDs do the same job. Before long, you've got a dozen tabs open and you're more confused than when you started.

If that sounds familiar, you're not alone. Let's clear it up together: what the difference really is, what each one is best at, and what to look for so you can choose with confidence.

The short answer: Lasers and LEDs can both deliver the red and near-infrared light used in light therapy. A laser sends out a narrow, focused beam at one exact wavelength. An LED gives off a wider, softer glow that covers larger areas easily. Neither is simply "better." The right choice depends on what you want to use it for.

What's the difference between laser and LED light therapy?

Both are types of photobiomodulation, a long word for using gentle red or near-infrared light to support how your cells work. You may also hear it called low-level laser therapy (LLLT) or red light therapy. The difference comes down to how the light is made.

A simple way to picture it: a laser is like a laser pointer, sending light in a tight, focused beam at one precise wavelength. An LED is more like a flashlight, spreading a softer glow over a wider area and covering a slightly broader range of wavelengths.

Lasers came first. Light therapy research began in the late 1960s, not long after the laser was invented, and for years many researchers assumed a laser's focused beam was essential. Over time, LEDs became popular too, thanks to their easy home use, wide coverage, wearable designs and lower cost.¹

Does laser light go deeper than LED light?

You'll see this claim a lot, and the honest answer is that it's a little more complicated. How far light reaches depends mostly on three things:

1. Wavelength. Near-infrared light (around 800–850 nm) generally reaches deeper than visible red light (around 630–660 nm).
2. Power and dose. How much light energy reaches the area, and for how long.
3. Fit. How close the light sits to your skin. Light that sits close to your skin delivers more of its energy where you want it.

Researchers are still exploring how much a laser's focused beam adds once light enters the skin.¹ What matters most is that a device delivers the right wavelength, at the right dose, to the right spot.

Is laser or LED better for hair?

For hair, most of the research involves laser diodes in the red range, often around 650 nm.

In a clinical trial published in Dermatologic Surgery, women with pattern hair loss who used the Capillus Pro every other day for 17 weeks saw a 51% greater increase in hair counts than those using an inactive device.² Another analysis of hair studies found that the amount of light energy delivered in each session mattered more than the number of diodes on a device.³

This is why Capillus laser caps use medical-grade laser diodes.

Capillus laser caps are FDA-cleared to treat androgenetic alopecia and promote hair growth in men with Norwood-Hamilton patterns IIa–V and women with Ludwig-Savin patterns I–II or frontal patterns, with Fitzpatrick skin types I–IV.⁴ Results take time and vary from person to person. You can compare all Capillus laser caps, including the Capillus TriSpectrum, which combines 650, 780 and 808 nm light. You can learn more about how laser therapy for hair growth works.

Is laser or LED better for skin?

For the face, LEDs are the go-to. According to the American Academy of Dermatology, most at-home red light devices for skin use LEDs.⁵ Here's why they work so well for faces:

• They cover your whole face at once, instead of one small spot at a time.
• One device can offer several colors. Red and near-infrared light are often used in skin renewal routines, while blue light is often used in routines focused on breakouts.
• They're gentle, which suits regular use on delicate facial skin.

The Capillus Face Mask is an LED mask with red (650 nm), near-infrared (850 nm) and blue (405 nm) light, plus a combined pink mode. The Face Mask protocol walks you through each mode.

At-home devices are designed for regular use over time, so consistency matters, and changes tend to be gradual.

What about joints and muscles?

For a small area like the hand and wrist, a device that wraps closely around the joint can deliver light right where you want it. The Curavi Glove is a laser therapy glove with 104 laser diodes.

For larger areas like the back, LED panels make it easier to cover more ground.

Laser vs. LED at a glance

What to look for in a light therapy device

With so many options out there, here's a simple checklist, and how Capillus measures up:

1. Clearance for the use you care about. Check whether a device is cleared for what you want to use it for. Capillus was the first laser cap cleared by the FDA for hereditary hair loss.
2. The right light source for the area. Focused lasers for the scalp, wide LEDs for the face. Capillus uses medical-grade lasers in its caps and LEDs in the Face Mask.
3. Well-studied wavelengths. Red light around 650 nm and near-infrared around 800–850 nm are the most studied. Capillus devices use wavelengths in these ranges.
4. Good coverage and fit. Light that sits close to the treatment area wastes less. Capillus caps spread 272 to 312 laser diodes across the scalp, depending on the model.
5. An easy routine. The best device is the one you'll actually use. Capillus caps run hands-free for 6 minutes a day and fit discreetly under a baseball cap, and the Face Mask is hands-free too.
6. Peace of mind. New Capillus laser caps bought on capillus.com come with a 6-month satisfaction guarantee, and many models are HSA/FSA eligible.

Is laser or LED light therapy safe?

Both are generally considered gentle when used as directed. They run at low power and don't heat or cut the skin the way surgical lasers do. A few simple precautions:

• Protect your eyes. Don't look directly into the light, and follow your device's instructions on eye protection.
• Check with your doctor first if you take any medication or have a condition that makes you sensitive to light.
• Follow the instructions. More time isn't always better, so stick to the recommended session length.

Frequently asked questions

Is red light therapy the same as laser therapy?

Not exactly. "Red light therapy" describes the color of the light, which can come from lasers or LEDs. Low-level laser therapy refers specifically to devices that use laser diodes.

Are LED devices weaker than lasers?

Not necessarily. A device's effect depends on its wavelength, power and how much light reaches the area, not just whether it uses lasers or LEDs.

What is a cold laser?

"Cold laser" is another name for low-level laser therapy. The lasers run at low power, so they don't noticeably heat the skin.

How long does it take to see results?

It depends on the device and what you're using it for. Light therapy works gradually, so most people use it consistently for several months. Results vary from person to person.

Can I use light therapy alongside other treatments?

Many people do. If you're under a doctor's or dermatologist's care, check with them about how light therapy fits into your routine.

A final word

Choosing between laser and LED doesn't have to be confusing. Think about what you want to focus on, then look for a device designed for that use that's easy enough to use every day. If thinning hair is on your mind, explore Capillus laser caps. If skin is your focus, the Capillus Face Mask brings red, near-infrared and blue LED light together in one hands-free mask. And if you're ever unsure, your doctor or dermatologist is a great person to ask.

This article is for general information and isn't medical advice. Talk to your doctor or dermatologist about your health and treatment options.

Sources

1. Heiskanen V, Hamblin MR. Photobiomodulation: lasers vs. light emitting diodes? Photochemical & Photobiological Sciences. 2018;17(8):1003–1017.
2. Friedman S, Schnoor P. Novel approach to treating androgenetic alopecia in females with photobiomodulation (low-level laser therapy). Dermatologic Surgery. 2017;43(6):856–867.
3. Gupta AK, et al. Dermatologic Therapy. 2020.
4. U.S. Food and Drug Administration. 510(k) Premarket Notification K192012, Capillus laser devices.
5. American Academy of Dermatology. Red light therapy and your skin.