Cold Laser, also known as Low-Level Laser Therapy or LLLT, and Class IV Laser Therapy both use light for healing, pain relief and inflammation reduction. However, there are great differences in power, depth to which light penetrates tissues, treatment time, and best application for different conditions of pain, for both physical rehabilitation and for cosmetic applications.
Demand for non-invasive and drug-free alternatives to treat is constantly growing. That’s why it’s important to distinguish between devices of different classes to find the most suitable one for use in a variety of settings – from distributing it in clinics to applying it in treatment sessions. High-powered Class IV laser devices, developed and manufactured by leading manufacturer, supplier and factory Arfurla, are best used for treating deeper layers of tissue to quickly bring relief to patients with chronic pain as well as sports injuries.

Understanding the Two Laser Types
Laser therapy uses the principle of photobiomodulation. There are certain wavelengths of light that interact with cells and their components to trigger a variety of biological processes. The main difference between Class IV laser therapy and Cold Laser Therapy is the power of the laser and how far into the tissue it is able to penetrate.
Terapia laserowa klasy IV
Class IV lasers emit high levels of power at over 500 milliwatts, typically 10-30 watts or more, allowing for deep penetration into muscle, joints and other tissue up to 10cm or more in depth, depending on the specific wavelength and treatment parameters.
Arfurla’s Class IV Therapeutic Laser System, a 30.0 Watt GaAlAs Diode Laser, 980nm/810nm continuous wave laser, is a high-power device which provides maximum bio-stimulation and gives a warm sensation during treatment. Arfurla is a high-tech manufacturer with its own R&D department and factory. The company designs and manufactures its therapeutic laser systems to be of the highest quality, most reliable, efficient and versatile for a wide range of medical and aesthetic applications.
Key Features of Class IV Laser Therapy
Deep penetration into muscle, joint, and connective tissue
Shorter treatment sessions due to higher energy delivery
Gentle thermal effects for enhanced comfort and circulation
Suitable for high-volume clinical settings
Supports both therapeutic and certain aesthetic outcomes
Cold Laser Therapy (Low-Level Laser Therapy)
There are Cold Lasers or also referred to as LLLT devices. These devices operate below 500mW. No perceptible heat is emitted and superficial tissues such as nerves on the surface of the skin and small joints are treated. Treatments are gentle but require longer treatment times to deliver an adequate dose.
Cold lasers are typically effective for superficial or minor complaints, with a depth penetration of about 0.5 to 2 cm, making them of little value for deeper musculoskeletal complaints.
Key Features of Cold Laser Therapy
Non-thermal, comfortable application
Ideal for surface-level nerve repair and wound care
Safe for frequent sessions on sensitive areas
Promotes cellular regeneration without heat
How Each Works in the Body
Both treatments induce photobiomodulation by increasing the activity of the mitochondria. Absorption of light by cytochrome c oxidase in the mitochondria generates ATP, which in turn boosts cellular energy production, metabolism and repair.
Mechanism of Class IV Laser Therapy
Long wavelength lasers, 800nm – 1000nm, at high power levels penetrate deep into the tissues. The biological effects of these lasers are:
Improved circulation through vasodilation
Reduced inflammation via modulation of mediators
Analgesic effects by calming nerves and releasing endorphins
Przyspieszona naprawa tkanek i synteza kolagenu
Arfurla’s diode laser systems enhance healing by increasing ATP, reducing oxidative stress caused by free radicals and thereby boosting cellular metabolism. The effects of the laser – photochemical as well as the mild, non-aggressive, photothermal effects – bring about immediate relief and promote swift recovery from wounds and injuries. The laser treatments provide the patient with a feeling of soothing warmth.
Mechanism of Cold Laser Therapy
Lower power densities are used to treat superficial chromophores and promote nerve regeneration, microcirculation and lymphatic drainage. It is designed for precise superficial treatments that do not generate excessive heat. As such, it is well suited for non-invasive treatments of delicate tissues and structures.
Which Conditions Respond Best
The choice of instrument depends on the depth of the tissue, the degree of acuity of the condition, and the treatment goals.
Class IV Laser Therapy Is Often Preferred For
Chronic joint pain, such as arthritis in knees, shoulders, hips
Low back pain, sciatica, and neck pain
Sports injuries, muscle strains, tendonitis
Post-surgical recovery and inflammation
Plantar fasciitis and deep musculoskeletal issues
Cold Laser Therapy Is Often Preferred For
Superficial nerve conditions, such as carpal tunnel, neuropathy
Wound healing, ulcers, and skin lesions
Facial nerve issues, such as Bell’s palsy
Small joint arthritis
Acute superficial inflammation
Most protocols now are a combination of the above protocols for total care. Reducing deep inflammation with Class IV lasers followed by surface care with cold lasers.
The Benefits of Laser-Based Healing
Laser therapy can be very effective as a non-invasive, drug free treatment with few side effects. There are many benefits to Laser Therapy that are shared with all types of Laser Treatments.
Shared Benefits of Laser Treatments
No downtime
Compatibility with physical therapy and medications
Enhanced natural healing mechanisms
Reduced reliance on pharmaceuticals
The high powered Class IV machines as found in some of Arfurla’s models, are very efficient systems in busy clinics and treat deeper targets within a shorter amount of time to deliver an effective dose of therapy.
Clinical Advantages of High-Power Laser Therapy
Easy, noninvasive application
Effective pain relief and anti-inflammatory action
Accelerated tissue repair and improved blood flow
Shortened treatment times with long-lasting effects
Safe profile with proper protocols
Arfurla’s multifunction 12-in-1 diode laser platform brings to the field of physiotherapy a wide range of applications offered by vascular and aesthetic laser, while delivering high return on investment for the clinic.
Dlaczego moc lasera jest tak ważna?

Wavelength governs depth, while power determines energy saturation at that depth. Higher wattage delivers more photons per unit time, enabling deeper therapeutic impact in less time.
Example
1 Watt laser: ~40 seconds for 10 Joules at 4 cm depth
4+ Watt Class IV laser: ~10 seconds for the same dose
Improving the efficiency of pain relief will benefit both patients and health care providers – patients will receive pain relief more quickly, and health care providers will have a more efficient practice.
Safety and Clinical Considerations
Treatments should only be administered by trained personnel using the proper eye gear and dosage. Caution should be exercised in treating areas that contain malignancies or are pregnant in some countries. Treatment should be administered in the correct amount in order to avoid abuse. The Arfurla system is designed with safety in mind and has been carefully engineered and supports that end.
Arfurla’s Class IV Solutions for Clinics and Distributors
Arfurla is a High-Tech Manufacturer of Diode Laser Systems – A Distributor Friendly OEM / ODM Factory with R&D, Manufacturing capabilities. Hangzhou Arfurla’s Laser Systems are offered to Distributors and to Medical Facilities around the World as a Premium, Cost-Effective, Reliable solution.
AFL Medical 12-in-1 function including pain management as well as rehab support via Their Dedicated Physiotherapy Lasers. Also they offer excellent after sales service and comprehensive training as well as very competitive wholesale pricing.
Frequently Asked Questions (FAQs)
Is Class IV Laser Therapy better than Cold Laser Therapy?
In short, no. They both have their own applications and treatment benefits. While Class IV lasers are capable of treating deep tissues and chronic conditions, Cold Laser Therapy are better suited for more superficial treatments and applications that require a delicate touch. The treatment will depend on the diagnosis and intended results.
Can laser be used in conjunction with other treatments?
Yes. The Laser can be used in conjunction with physical therapy and or rehabilitation as well as with other conventional treatments for added value.
Współpracuj z zaufanym producentem i dostawcą
For purchasing high quality physiotherapy lasers of premium class, procurement departments, distributors as well as owners of clinics and medical spas should contact Z Arfurem – a manufacturer, supplier and producer of high-end diode laser systems for medical applications. AFL Medical 12-in-1 platform as well as dedicated solutions of Class IV lasers for strongest treatment effects and best possible ROI in the clinical environment are presented on this website.
We are eager to provide you with detailed technical specifications and a quotation as well as offer OEM/ODM collaboration opportunities. You can obtain all of the information you need on our official site as well as contacting us directly. We will be happy to provide you with the highest quality laser therapy equipment that is non-invasive and effective for treating a variety of diseases and conditions that are in high demand worldwide. We at Arfurla manufacture products of the highest quality, provide our clients with the best possible supply and offer them full technical assistance 24/7 to satisfy all B2B needs. Skontaktuj się z Arfurlą już dziś.