Low-Level Light/Laser Therapy Versus Photobiomodulation Therapy
Technology context Terminology governing how light-therapy devices are described
Finding: Established "photobiomodulation therapy" as the preferred term, replacing "low-level laser therapy" and "low-level light therapy", which lack agreed technical definitions.
Main limitation: A two-page editorial on nomenclature. It makes no claim about clinical effectiveness and reports no study data - no abstract is held in the PubMed record.
Executive summary
This short editorial is the reason the field is now called photobiomodulation rather than low-level laser therapy, and it matters to buyers for a reason that has nothing to do with academic tidiness.
The terms it replaced - 'low-level laser therapy', 'low-level light therapy', and informally 'cold laser' - have no agreed technical definition. There is no threshold below which light is 'low-level' and above which it is not. A device described that way has told you nothing measurable.
'Photobiomodulation therapy' was adopted as the preferred term precisely because it describes the phenomenon - modulation of biological processes by light - without implying a power classification that does not exist.
The PubMed record for this article contains no abstract, and the editorial reports no study data, sample, or outcomes. Those fields are recorded as not reported in the source throughout this entry rather than inferred.
Its practical value for a buyer is as a linguistic test. A manufacturer still marketing 'cold laser' or 'low-level' devices in 2026, without accompanying wavelength, irradiance and dose figures, is using language the field abandoned a decade ago.
Why this research matters
Terminology is a practical buying signal in a category with no regulatory standard for reporting output.
Words like 'low-level' and 'cold laser' sound technical and are not. Wavelength in nanometres, irradiance in mW/cm² at a stated distance, and dose in J/cm² are technical. Knowing which is which is a fast way to sort serious manufacturers from the rest.
Study design
- Document type
- Terminology consensus editorial
- Purpose
- Establish preferred nomenclature for the field
- Preferred term adopted
- Photobiomodulation therapy
- Terms superseded
- Low-level laser therapy; low-level light therapy
- Study design
- Not applicable - this is an editorial, not a study
- Sample size
- Not reported in the source
- Population
- Not reported in the source
- Outcomes
- Not reported in the source
- Abstract
- No abstract is held in the PubMed record for this article
What the researchers found
The editorial establishes 'photobiomodulation therapy' as the preferred term for the field, replacing 'low-level laser therapy' and 'low-level light therapy'.
No study results, effect sizes, confidence intervals, or p-values are reported, because this is a nomenclature statement rather than a study. The PubMed record contains no abstract.
Any numerical claim attributed to this document would be fabricated, and none is presented here.
What the results mean
The field concluded that its own established terminology was imprecise enough to require replacement. That is a candid admission and a useful one.
For a reader, the consequence is straightforward: category labels in this field do not convey specifications. 'Low-level', 'cold laser', 'therapeutic light' and similar phrases describe marketing positioning rather than device output.
The information that does convey specification is wavelength, irradiance, measurement distance, and dose.
What this study does not prove
- It makes no claim about clinical effectiveness of photobiomodulation for any condition.
- It reports no study data, sample, population, or outcomes.
- It does not establish standards for measuring or reporting device output - only for naming the field.
- Adoption of a preferred term does not imply the underlying therapy is established.
- It does not distinguish between laser and LED devices in terms of clinical equivalence.
Evidence strength
Expert consensus / terminology guidance
This is a consensus statement on nomenclature published as a journal editorial, not a study. It carries authority because of who wrote it and the standardisation it produced, not because of data.
It sits in the library as a technical document rather than as evidence of efficacy, and it is classified that way deliberately.
Strengths and limitations
Strengths
- Authored by recognised figures in the field.
- Produced a durable standardisation that the literature subsequently adopted.
- Removes a genuinely misleading term from professional usage.
- Published in the field's specialist journal.
Limitations
- A two-page editorial with no abstract in the PubMed record.
- No data of any kind reported.
- Addresses only nomenclature, not measurement or reporting standards - which a 2021 critical review identifies as the field's actual gap.
- Consumer marketing has largely not adopted the preferred terminology.
Does this apply to the equipment IMPERVITA sells?
This applies to how every red light product is described rather than to what any of them do.
It gives a buyer a quick screening test. A manufacturer using precise, current terminology alongside published wavelength, irradiance and dose figures is engaging with the field as it exists. One still selling 'cold laser' or 'low-level' devices with no measurable specifications is not.
It says nothing about whether a device works.
Evidence in context
The terminology has been broadly adopted in the peer-reviewed literature since 2015. It has not been adopted in consumer marketing, where the older terms persist.
The deeper problem this editorial does not solve was identified in a 2021 critical review: there is still no regulatory standard governing how photobiomodulation device output is measured and reported. Naming the field consistently was a first step; standardising measurement has not followed.
That remains the case as far as we are aware.
Related research
- Photobiomodulation: a review of the molecular evidence for low level light therapy Identifies the absence of regulatory standards as the field's central obstacle - the problem terminology alone did not fix.
- Mechanisms and applications of the anti-inflammatory effects of photobiomodulation The mechanistic account, and the source of the dose concepts that should replace vague category labels.
- Photobiomodulation in human muscle tissue: an advantage in sports performance? Demonstrates the device heterogeneity that imprecise terminology helped conceal.
- Health products compliance guidance FTC guidance on substantiating health claims, relevant to how these devices are advertised.
Practical buyer relevance
Use this as a thirty-second screening test.
If a product page leads with 'cold laser' or 'low-level laser therapy' and provides no wavelength, irradiance or dose figures, you are looking at marketing language the scientific field retired a decade ago.
If it provides wavelengths in nanometres, irradiance at a stated measurement distance, and a session dose, you are looking at a manufacturer who has read the literature they are citing.
That distinction will narrow a shortlist faster than any other question in this category.
Safety context
This document contains no safety guidance, as it addresses terminology only.
For safety information on photobiomodulation, see the systematic review of oncologic safety listed in this library, and follow the eye-safety guidance supplied with any specific device. People with a photosensitising condition, taking photosensitising medication, with a history of skin cancer, or who are pregnant may require guidance from a qualified healthcare professional before use.
Full source record
- Title
- Low-Level Light/Laser Therapy Versus Photobiomodulation Therapy
- Authors
- Anders JJ, Lanzafame RJ, Arany PR
- Organization
- Photomedicine and Laser Surgery (editorial)
- Publication
- Photomedicine and Laser Surgery
- Year
- 2015
- Volume / issue / pages
- Volume 33, issue 4, pages 183-184
- PMID
- 25844681
- PMCID
- PMC4390214
- Study type
- Terminology consensus editorial
- Sample size
- Not applicable
- Population
- Not applicable
- Topic
- Red Light, regulatory
- Document type
- Technical document
- Technology context
- Terminology governing how light-therapy devices are described
- Related equipment context
- Red Light Therapy
- Source last verified
- 19 August 2026
References
- Low-level light/laser therapy versus photobiomodulation therapy
- Photobiomodulation: a review of the molecular evidence for low level light therapy
- Mechanisms and applications of the anti-inflammatory effects of photobiomodulation
- Photobiomodulation in human muscle tissue: an advantage in sports performance?
- Health products compliance guidance
Information provided by IMPERVITA is for educational and general wellness purposes and is not intended to replace professional medical advice, diagnosis, or treatment.
