Photobiomodulation: Lasers vs. Light Emitting Diodes?
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This review compares lasers and light-emitting diodes (LEDs) in photobiomodulation (PBM) and examines whether both light sources produce similar therapeutic effects. PBM uses red or near-infrared light to stimulate biological processes involved in healing, pain reduction, and tissue repair. The authors reviewed the physical differences and biological mechanisms of lasers versus LEDs.
The study explains that while lasers emit coherent, focused light and LEDs emit non-coherent, broader-spectrum light, these differences may not significantly affect biological outcomes in many PBM applications. What matters more is the wavelength, energy density, power, and dose delivered to tissues, rather than whether the source is a laser or LED.
The review found that both lasers and LEDs can trigger similar cellular responses, including mitochondrial stimulation, increased ATP production, improved circulation, reduced inflammation, and enhanced tissue healing. LEDs may offer advantages such as lower cost, larger treatment areas, and easier device design, while lasers can provide more focused penetration in specific applications.
Key takeaway: Both lasers and LEDs appear effective for PBM, and therapeutic outcomes depend more on correct treatment parameters than on the type of light source itself. LEDs may serve as a practical and cost-effective alternative in many clinical settings.
https://pmc.ncbi.nlm.nih.gov/articles/PMC6091542/