Read Time: 8 minutes
Author: Samantha Thompson
Updated: 20th June 2026
Ever wondered if pulsed red light therapy is just a gimmick or if it really works? Let’s dive in and break it down in plain English!
What Is Pulsing in Red Light Therapy?
Pulsing means that the red light therapy device switches on and off rapidly instead of staying on continuously.
Imagine a blinking light versus a light that never stops shining. Some experts say pulsing adds nothing extra, while others believe it has hidden benefits.
The research is genuinely interesting, and the short answer is: it depends what you are treating.
The Science Behind Pulsing: Why Bother?
Pulsing lets us use higher peak power for a short time without overheating our tissues.
That means the light can penetrate deeper into the skin or even the brain, while the off periods give our tissues a chance to dissipate heat.
Researchers also believe pulsing may change how ions move across cell membranes and help mitochondria respond differently to light energy compared to continuous wave delivery.
The mechanisms are still being worked out, but there is real evidence that frequency matters.
What Do the Studies Say? Let’s Break It Down!
Below are summaries drawn from published photobiomodulation research.
Where specific studies could be independently verified on PubMed, links are included. Others reflect the general direction of the published literature.
Pain Relief
Studies comparing pulsed and continuous light for pain conditions such as menstrual cramps and musculoskeletal pain generally find that both methods reduce pain effectively.
In many cases, pulsing offers no significant additional advantage over continuous wave for straightforward pain applications.
The takeaway: you do not need pulsing for pain relief if your device does not support it.
Bone and Cell Growth
Studies using different pulse frequencies on bone cells (osteoblasts) and related tissue suggest that lower frequencies in the 1-8 Hz range can enhance cellular proliferation compared to both continuous light and higher pulse rates.
This area of research points to frequency-specific effects at the cellular level that go beyond simply delivering energy.
Protecting the Brain at High Power
One important practical benefit of pulsing is safety at high power levels.
When continuous light is applied to neural tissue at very high irradiance, tissue heating can cause damage.
Pulsing the same light prevents overheating, making it possible to deliver more energy per session safely.
This is particularly relevant for transcranial (brain-targeting) applications where higher power is needed to reach deep tissue through the skull.
Brain Injury Recovery: 10 Hz Stands Out
One of the best-documented findings in pulsed photobiomodulation research is that 10 Hz pulsing consistently outperforms both continuous wave and higher frequencies (such as 100 Hz) for traumatic brain injury (TBI) recovery.
A landmark study from Harvard Medical School and Massachusetts General Hospital (Ando et al., 2011, PLoS One) compared continuous wave, 10Hz pulsed, and 100 Hz pulsed 810nm laser for TBI in mice.
The 10 Hz pulsed group showed the best improvement in neurological severity scores, the lowest brain lesion volume at 2, 15, and 28 days post-injury, and even demonstrated antidepressant effects in forced swim and tail suspension tests.
All laser groups outperformed no treatment, but 10 Hz was the clear winner. View Study on PubMed
Brainwave Tuning: 40 Hz Pulsed Light
A randomised, sham-controlled, double-blinded human study (Zomorrodi et al., 2019, Scientific Reports) used the Vielight device to deliver 810nm near-infrared light pulsed at 40Hz to the brain’s default mode network.
Using EEG, the study found that a single session significantly increased the power of higher-frequency brain oscillations (alpha, beta, and gamma) and reduced slower oscillations (delta and theta) compared to sham treatment.
The researchers noted this was the first demonstration that pulsed transcranial photobiomodulation can non-invasively modulate neural oscillations.
These brainwave changes are associated with improved attention, memory, and cognitive performance. View Study on PubMed
Tendon Healing
Studies comparing continuous wave with pulsed settings for tendon injuries suggest that varying the pulse frequency during treatment, rather than using a fixed setting, may improve healing outcomes.
This points to the idea that the optimal pulse rate may shift depending on the stage of tissue repair.
Wound Healing: 10Hz Wins Again for Compromised Healing
A study from India’s Defence Institute of Physiology and Allied Sciences (Keshri et al., 2016, PLoS One) compared 810nm laser at 10 Hz pulsed, 100 Hz pulsed, and continuous wave on full-thickness skin wounds in hydrocortisone-immunosuppressed rats, a model designed to replicate the difficult healing conditions seen in compromised patients.
The 10 Hz pulsed group significantly outperformed both continuous wave and 100 Hz in wound closure, collagen deposition, re-epithelialization, and reduction of pro-inflammatory markers (including NF-kB and TNF-alpha).
The study concluded that pulsed 810nm at 10 Hz most effectively promotes wound healing when the immune system is suppressed. View Study on PubMed
When Continuous Wave Beats Pulsing
Not every study favours pulsing. For certain wound healing and muscle inflammation applications, particularly at lower doses, continuous wave light has been shown to perform as well as or better than pulsed light.
The picture is genuinely mixed, and the most honest summary is that the best setting depends on the tissue type, the condition being treated, and the frequency being used.
Dental Applications
For dental applications such as reducing root resorption and managing tooth sensitivity, the published evidence generally shows that both pulsed and continuous wave protocols are effective, with no consistently significant advantage for one over the other. Both are useful.
Mast Cells and Healing Initiation
Research into mast cell activation suggests that specific pulse frequencies can help kick-start the body’s healing response.
Mast cells play a role in the early stages of tissue repair and immune modulation, and certain frequencies appear to influence their activity more than others, though optimal protocols are still being established.
How Your Body Works With Light
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Modern environments have created a state of mal-illumination, where we are deprived of the natural light balance that our ancestors received. Healthy light bulbs, designed to emit therapeutic wavelengths like green, red, and amber, can help balance this deficiency.
Red and NIR light panels further restore mitochondrial function, repair tissues, and reduce inflammation, helping to counter the unnatural impact of modern indoor environments on our health.
So, Does Pulsed Red Light Therapy Really Work?
Yes, pulsing does have an effect, but it is not a universal upgrade. The evidence points in a clear direction:
Lower pulsing frequencies, particularly 10 Hz, consistently outperform continuous wave and higher frequencies for neurological applications including brain injury recovery and wound healing in compromised tissue. 40 Hz has specific effects on brainwave activity that continuous wave cannot replicate.
For pain relief and many skin applications, however, continuous wave light performs just as well. Pulsing is not a magic bullet.
If your device has a pulse setting, experimenting with lower frequencies (10-40 Hz) for brain and deep tissue applications is well-supported by the literature. For skin and surface applications, continuous mode is a perfectly solid choice.
One practical note: pulsing can occasionally cause visual flickering that leads to eye strain or headaches in sensitive individuals. Always wear appropriate eye protection, particularly with higher-power devices.
Final Thoughts
The science behind pulsed red light therapy is still maturing. What is clear is that pulsing can change how the body responds to light at a biological level, and that frequency selection is a real variable, not just a marketing feature.
The most exciting applications are in neuroscience: 10 Hz for brain injury recovery and 40 Hz for brainwave modulation are two of the most consistently replicated findings in the field.
For everyday skin and pain applications, the choice between pulsed and continuous comes down to your device and personal preference.
Both pulsed and continuous red light therapy work. Keep it simple, follow the evidence for your specific goal, and enjoy the benefits of light on your health.
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