Does Pulsed Red Light Improve Results? The Science Behind the Frequency

What clinical research says about pulsed vs. continuous light therapy—and why it may matter for results

What Is Red Light Therapy?

Red light therapy (RLT) is a non-invasive technique that applies visible red light (approximately 660 nm) and near-infrared light (approximately 850 nm) to the body to stimulate cellular activity. These wavelengths are absorbed by the mitochondria—the cell’s energy-producing organelles. Upon absorption, mitochondrial enzymes increase production of adenosine triphosphate (ATP), the primary energy currency in human cells, which supports repair, regeneration, and optimal function.

This photobiological effect is associated with benefits such as enhanced skin integrity, modulation of inflammation, improved microcirculation, and potential relief of pain or mood-related symptoms.

But not all light therapy is delivered the same way. Some devices emit a steady beam of light (called continuous wave), while others pulse the light rapidly—flashing on and off in quick cycles.

So, does pulsing the light actually make a difference? Let’s look at the research.

What Is Pulsed Light Therapy?

Pulsed light therapy simply means the light is turned on and off in rapid bursts—for example, 10 times per second (10 Hz). This is different from continuous wave (CW) light, which stays on the whole time.

While it might sound like a small change, pulsing the light can influence how your body responds. Some studies suggest that pulsed light may:

• Allow cells short recovery breaks between pulses

• Stimulate deeper tissues more effectively

• Avoid overheating the skin

What the Research Says

1. Pulsed Light Accelerated Healing Better Than Continuous

A study published in PLOS ONE tested how different light modes affected wound healing. They compared:

• Continuous wave light

• Pulsed light at 10 Hz

• Pulsed light at 100 Hz

Results: The group treated with 10 Hz pulsed light healed faster, showed lower inflammation, and had better tissue repair compared to other groups.

View study on PubMed →

2. Pulsing Helps Light Reach Deeper, Safer

Another study looked at how pulsed light affected tissue penetration. Using a 1064 nm laser (not LED), researchers found that pulsed light:

• Delivered more energy into deeper tissues

• Kept surface temperature lower than continuous light

While this study used a laser source, it suggests that pulsing light—even in non-LED formats—may help treat areas beneath the skin without the risk of overheating.

View study on PubMed →

3. A Range of Frequencies Show Biological Effects

A 2010 review analyzed multiple studies using both CW (continuous wave) and pulsed light. It found that frequencies between 10 Hz and 8,000 Hz were often more effective than continuous light for supporting healing, reducing inflammation, and increasing ATP.

Read the review on PubMed →

FAQs: Pulsed vs. Continuous Light Therapy

Why would pulsed light work better?

Pulsing may help the body absorb light more efficiently by preventing overstimulation and giving cells tiny recovery moments.

What’s the best frequency?

Studies suggest 10 Hz is particularly effective for healing and inflammation. Other frequencies may be useful for different goals.

Is pulsed light safer?

It can be. By allowing the skin to cool between pulses, it reduces the chance of overheating—especially when treating deeper tissues.

Do all red light devices use pulse mode?

No. Some use continuous light only. Others—like more advanced LED systems—offer both modes or adjustable frequencies. The Juveo R1 LED Mask, for example, includes an integrated pulse mode option designed to deliver light safely and effectively for deeper skin support.

Final Thoughts

Pulsed red light therapy isn’t just a gimmick—there’s real research behind it. While both continuous and pulsed modes can support healing and cell activity, certain frequencies (like 10 Hz) may offer enhanced benefits, especially when deeper tissue or inflammation is involved.

Choosing a device that offers both options may give you the flexibility to find what works best for your body.

Sources

1. Keshri GK et al. (2016). Photobiomodulation at 10 Hz improves wound healing outcomes in mice. PMCID: PMC5115773

2. Study on fluence and tissue heating: PMCID: PMC12245496

3. Hashmi JT et al. (2010). Effectiveness of pulsed vs continuous LLLT. PMCID: PMC2933784