Is Cold Laser Therapy the Same as Low-Level Laser Therapy?

Are Cold Laser Therapy and LLLT the Same Treatment?

Generally, yes. Cold laser therapy and LLLT usually describe the same approach: applying low-intensity laser light to tissue for a therapeutic purpose. However, sharing a name does not mean two devices or treatment protocols are identical.

The term “cold laser” is commonly used in clinical and consumer settings. LLLT is the more traditional technical term. Neither name identifies the exact wavelength, power, or energy dose used by a particular device.

What Does Low-Level Laser Therapy (LLLT) Mean?

LLLT stands for low-level laser therapy. It describes the therapeutic use of low-power laser light to produce biological effects rather than relying on heat to cut or damage tissue.

Other terms used in scientific literature include low-power laser therapy, low-intensity laser therapy, and soft laser. Research into this approach dates back to the late 1960s, shortly after the development of lasers (Anders et al., 2015; Heiskanen and Hamblin, 2018).

Why Is It Called Low-Level Laser Therapy?

“Low-level” distinguishes this approach from higher-power lasers designed to heat, cut, or remove tissue. The terminology is not a precise device specification, however. The actual output and treatment parameters depend on the equipment being used.

A 2015 terminology editorial noted that the words “low” and “level” are vague and do not establish a universal threshold for every device (Anders et al., 2015).

For this reason, patients should not assume that every device described as low-level laser therapy delivers the same amount of energy or produces the same effects.

What Does the Word “Cold” Mean in Cold Laser Therapy?

“Cold” refers to the treatment's intended nonthermal approach. The goal is not to heat tissue in the way surgical or ablative lasers do.

The term helps distinguish therapeutic light applications from laser procedures that rely on heat. It does not mean the device itself is cold or that no biological response occurs.

Is Photobiomodulation the Same as Cold Laser Therapy?

Not exactly. Photobiomodulation (PBM) is the broader term, while cold laser therapy is one way of delivering it.

PBM describes the interaction of non-ionizing light with biological tissue. It can include suitable laser, LED, and other light sources. Laser-based cold laser treatment therefore fits within the broader PBM category, but not every PBM treatment uses a laser.

Some scientific publications use PBM and LLLT as overlapping terms. However, PBM is broader because it does not restrict the light source to lasers (Dompe et al., 2020).

Why Do Researchers Prefer the Term Photobiomodulation?

Researchers have used different names for therapeutic light applications over the years. This created inconsistencies in scientific publications and clinical discussions.

In 2014, an international group of experts discussed the terminology used in the field. Their 2015 editorial supported the term photobiomodulation because it does not assume that a laser is the only suitable light source (Anders et al., 2015).

The term also allows researchers to describe light-related biological effects without assuming that the response must always involve stimulation.

A 2019 follow-up editorial further supported recognizing LED therapy and low-level light therapy within the broader PBM terminology (Anders et al., 2019).

Can Photobiomodulation Use LEDs Instead of Lasers?

Yes. Photobiomodulation is not limited to laser devices. LEDs and other suitable light sources can also be used.

Lasers were widely used during the earlier decades of PBM research. LEDs and broadband light sources have become more common in later applications. These sources can differ in how they deliver light and cover a treatment area (Heiskanen and Hamblin, 2018).

There is an important distinction, though. A 2021 review noted that it remains unclear whether LED-based sources produce physiological effects of the same nature and magnitude as laser systems used in many higher-quality studies (Glass, 2021).

The fact that both technologies can be used for PBM does not establish that every LED device is equivalent to every therapeutic laser.

What Is the Difference Between Cold Laser Therapy, LLLT, and PBM?

The main difference is terminology and scope. Cold laser therapy is a common clinical term. LLLT is the traditional technical term for low-level laser treatment. PBM is the broader scientific term for biological effects produced by suitable non-ionizing light.

The following table summarizes how the terms are commonly used.

These distinctions follow terminology discussions in the scientific literature, including publications addressing the relationship between low-level light therapy, lasers, and LEDs.

Is Red Light Therapy Another Name for Cold Laser Therapy?

Not exactly. Red light therapy is a general term for treatments that use red-spectrum light. Some red-light treatments fall within photobiomodulation, but the terms do not describe identical technologies in every situation.

Red and near-infrared wavelengths are commonly discussed in PBM research. A 2020 review identifies approximately 600 to 1,100 nanometers as a commonly used wavelength range in this field (Dompe et al., 2020).

However, a therapeutic laser, an LED panel, and a consumer red-light device can differ in several ways:

• Light source and wavelength
• Power output and irradiance
• Treatment area and coverage
• Energy delivered to the target tissue
• Intended use and treatment protocol

A device marketed as red light therapy is not automatically equivalent to a clinical cold laser treatment. The technology and treatment parameters need to be considered.

Does the Name of a Laser Therapy Device Matter?

The name provides a general description, but it does not tell the whole story. Two devices marketed under similar terminology may have different technical specifications and treatment protocols.

Important parameters include wavelength, power output, irradiance, energy density, and treatment duration. These details help describe how light is delivered to the intended treatment area.

Which Device Specifications Should Patients Ask About?

Patients can ask a qualified provider about the following details:

• Wavelength: The wavelength of light emitted by the device, measured in nanometers.
• Power or irradiance: How much light the device emits and how that energy is distributed over the treatment area.
• Energy dose: The amount of energy delivered to the treated area during a session.
• Intended use: The purpose and indications identified by the device manufacturer.
• Treatment protocol: How the treatment is administered, how frequently sessions occur, and how progress is reassessed.

No single specification automatically makes a device better. The appropriate equipment and protocol depend on the intended application and the evidence supporting that specific use.

How Can Patients Compare Different Light Therapy Treatments?

Start with the actual equipment and treatment protocol rather than relying on the product name alone.

Patients can use these questions when discussing light-based treatments with a qualified provider:

1. Does the device use a laser, LED, or another light source?
2. What wavelength does the device use?
3. What power or irradiance does it deliver?
4. How is the energy dose determined?
5. What condition is the treatment intended to address?
6. What research supports its use for that specific condition?
7. How often is treatment administered, and how is progress evaluated?
8. What potential side effects or limitations should patients know about?
9. Who performs the treatment, and what training do they have?

A provider should be able to explain the equipment and treatment approach in understandable terms.

Patients interested in how this treatment is offered locally can learn more about cold laser therapy in Vacaville.

What Does Medical Research Say About These Terms?

Research on terminology shows a gradual shift from low-level laser therapy toward the broader term photobiomodulation. One reason is that therapeutic light applications are no longer limited to laser sources.

The 2015 terminology editorial discussed the need for clearer scientific language. A 2019 follow-up publication further supported recognizing LED therapy and low-level light therapy as forms of PBM.

A 2025 expert consensus publication addressed the clinical application of photobiomodulation. A panel of 21 experts reached agreement on 38 statements covering principles, parameters, safety, and efficacy. The authors also identified the lack of standardized treatment parameters as a limitation for clinical use and research (Maghfour et al., 2025).

It is important to distinguish terminology from clinical effectiveness. Showing that cold laser therapy and LLLT overlap does not establish that all devices or protocols produce the same results.

Research findings must be interpreted in relation to the specific condition, wavelength, energy delivery, and treatment protocol being studied.

Some publications about terminology are editorials or perspective articles rather than clinical trials. They help explain how researchers use the terms, but they do not independently establish treatment outcomes.

For a closer look at how clinical evidence is evaluated, read what research says about cold laser therapy.

Frequently Asked Questions About Cold Laser Therapy and LLLT

What Is the Bottom Line on Cold Laser Therapy and LLLT?

Cold laser therapy and low-level laser therapy generally describe the same therapeutic approach. Photobiomodulation is the broader scientific term because it can include laser, LED, and other suitable light sources.

The terminology alone cannot tell you which device or treatment protocol is being used. Wavelength, power, energy delivery, and intended application all matter when evaluating a light-based treatment.

Patients exploring conservative care options can learn more about non-surgical pain management in Vacaville.

This article is for educational purposes only and is not medical advice. Speak with a qualified healthcare provider about your individual situation.