What Wavelengths Are Used for Pet Therapy?

Red light therapy for pets uses the same fundamental principle as human photobiomodulation therapy: exposing tissues to specific wavelengths of light that stimulate cellular activity. These wavelengths interact with cells in the body to support energy production, circulation, and tissue repair.

While pets and humans share similar biological responses to light therapy, understanding the wavelengths used in veterinary treatments can help pet owners choose the right therapy devices.

The Most Common Wavelength Ranges

Red light therapy devices for animals typically use two main wavelength categories:

Red light wavelengths

Approximately 620–660 nanometers (nm)

Near-infrared wavelengths

Approximately 800–900 nanometers (nm)

These ranges have been widely studied for their ability to penetrate biological tissues and stimulate cellular responses.

Why These Wavelengths Are Used

The reason these wavelengths are commonly used is that they fall within what scientists call the therapeutic optical window. Light within this range can penetrate skin and biological tissues more effectively than many other wavelengths.

When light reaches cells, it interacts with mitochondria, which are responsible for producing energy in the form of ATP. Increased ATP production may support cellular repair processes and improved tissue function.

Red Light for Surface Tissues

Red light wavelengths between 620 and 660 nm primarily affect tissues closer to the surface of the body. These wavelengths are commonly used for:

• skin conditions

• minor wounds

• superficial inflammation

• coat and skin health

Because red light is absorbed more readily by the skin, it is often used for treatments involving the outer layers of tissue.

Near-Infrared Light for Deeper Tissues

Near-infrared wavelengths between 800 and 900 nm penetrate deeper into the body. These wavelengths are commonly used for conditions affecting:

• joints

• muscles

• tendons

• connective tissue

Many veterinary therapy devices combine both red and near-infrared light to target multiple tissue depths simultaneously.

Similarities Between Human and Pet Therapy

Pets respond to red light therapy in ways that are biologically similar to humans. For this reason, many therapy devices designed for humans can also be used for animals when applied appropriately.

However, pet-specific devices may include features designed for fur coverage and animal comfort.

Conclusion

Red light therapy for pets typically uses wavelengths between 620–660 nm (red light) and 800–900 nm (near-infrared light). These wavelengths are widely used because they penetrate tissues effectively and support cellular energy production.