Powerful LLLT laser for private use.
The PERSONAL-LASER™ L400 is the "big brother" of the PERSONAL-LASER™ L200 laser . It is also the manufacturer's most powerful LLLT laser for home use. The laser output is a maximum of 400 mW and a wavelength of 808 nm, which lies in the invisible spectrum (infrared/IR).
The PERSONAL-LASER™ L400 is powered by a Li-ion battery, allowing for extended treatment times. It is an effective and powerful LLLT laser therapy device specifically developed for the treatment of pain and injuries. The laser wavelength of 808 nm ensures the necessary penetration depth into skin and tissue. Treatment depth: approximately 3-4 cm.
Acupuncture with low-level laser therapy
The double power and different wavelength allow the laser light to penetrate deeper into the muscles, tendons, and joints being treated. Due to the higher power of the PERSONAL-LASER™ L400 laser, the duration of treatment can be reduced.
The PERSONAL-LASER™ L400 provides faster results after treatments, and healing times can be shortened. In addition, the treatment areas are different. The Personal Laser L200 is primarily used for wounds, skin conditions, tinnitus, and arthritis. The L400, on the other hand, is used for muscle, tendon, and joint problems, as well as for the supportive treatment of scar tissue.
The device is the perfect choice for those in a hurry or those with a deeper injury. The 808nm wavelength in the infrared spectrum is ideal for deeper, more intensive therapy! 
In general, the optimal wavelength range for LLLT/PBM (photobiomodulation) applications ranges from 600 nm to approximately 1000 nm, also referred to as the "biological window." At longer wavelengths, the laser penetrates deeper into the tissue. At the same time, absorption by hair and skin pigment is minimized.
Shorter wavelengths are used to treat superficial wounds and joint injuries. Longer wavelengths are better suited for laser treatment of muscle and tendon injuries.
Laser light is said to have the following effects, with an increase of:
• Cell activities
• Cell metabolism
• ATP production
• Local concentration of lymphocytes, leukocytes and macrophages
• Blood perfusion
• Collagen production
• The absorption of oxygen into the cells
• Normalization of the Na-K pump
• Normalization of cell membrane potential
Laser therapy with LLLT lasers is supported by numerous clinical studies
In recent years, the number of controlled scientific studies in the field of laser therapy has increased again.
PubMed, a renowned database for medical articles, now contains more than 6,000 scientific articles on low-level laser therapy (LLLT). The amount of scientific knowledge on laser therapy under clinical conditions has now reached a level similar to or exceeds that of pain medications for the treatment of musculoskeletal disorders.
The applications of LLLT are broad, with four key clinical goals: irradiating injured areas/wounds with laser light to promote healing, remodeling, and/or reduce inflammation; an analgesic effect on nerves to achieve pain relief; the reduction of edema and inflammation; and the use of low-level laser therapy on trigger points to promote muscle relaxation and reduce sensitivity.
Because LLLT is non-invasive, it is very useful for people with a phobia of needles or for patients who cannot tolerate therapies with nonsteroidal anti-inflammatory drugs.
LEDs compared to Class 3B laser diodes
There are many different laser therapy devices on the market for physical therapy applications. LED devices are often referred to as laser therapy devices, but they differ in several respects from "real" lasers, such as the Personal Laser L400.
LED stands for light-emitting diode. A diode that emits light when current flows through it, often in bright colors. LASER, on the other hand, stands for "light amplification by stimulation of emitted radiation." A light source is amplified in a medium and emitted in a very specific way, described below.
Real lasers are monochromatic. This means that the light produced by a laser has a single, very specific wavelength. LEDs are also capable of producing monochromatic or nearly monochromatic light. However, diode lasers like the L400 concentrate their entire power into a small spot. Laser light is coherent, and coherent light can be transmitted over much greater distances than incoherent light.
LEDs distribute their power over a larger area, but without reaching the depth of tissue penetration that is possible with a real laser.
Calculation of laser dosage and energy density
To calculate the dose of energy density, the units must be expressed in standard units. The power of a laser device is measured in watts, with one milliwatt equal to 1/1000 of a watt.
Before performing dose calculations, the laser's power can also be converted into watts. For the L400, this is 0.4 watts. Power is the rate of energy delivery over time, meaning that power, energy, and time are interrelated.
The energy emitted by a laser can be calculated by multiplying the laser power by the treatment duration. For the L400, for example, this is 3 minutes.
Energy (delivered dose) = power x time = 0.4W x 180s = 72 joules (J)
An important criterion for the treatment is energy density. This is determined by dividing the delivered energy (J) by the area in square centimeters.
Energy density = energy/area (J/cm²)
Power unit = watt (W)
Area = cm2
Energy = Joule (J)
Energy density = joules per square centimeter (J/cm²)
Calculating the energy density
| Area | energy | Energy density |
| 100cm² | 72 years | 0.72J/cm² |
| 10cm² | 72 years | 7.2J/cm² |
| 1cm² | 72 years | 72J/cm² |
LLLT laser treatment technology
Laser treatment should be performed directly on the skin, not through clothing, bandages or wraps, as these absorb some of the laser light.
There are a few points to consider to ensure effective laser application:
• Hold the laser perpendicular to the skin, otherwise the deflection of the beam will increase the reflection of the light energy.
• Regardless of whether the point or scan treatment technique is used, the laser optics should be in contact with the skin whenever possible. This eliminates a large portion of the reflected energy loss from the skin, allowing more energy to penetrate the tissue.
When light pressure is applied to the skin with the L400 laser, part of the blood supply to that area can be suppressed, thereby reducing the absorption of energy by the hemoglobin and oxyhemoglobin in the blood.
• If the laser is used in physiotherapy practice, the patient record should include clinical progress, the total amount of joules delivered to each area, the treatment technique used and a plan for the next session.
Point treatment technique 
The point treatment is performed by moving the laser from point to point, as shown in the image, with a distance of 1-2 cm between each point. The laser remains on each point for the time in seconds specified in the dosage recommendation.
When laser treating wounds and eczema, the laser should be held approximately 1 cm from the skin. Once the skin is just outside the open area, the laser optics can be gently pressed back into place.
Scan treatment technique
The scanning technique is another treatment option that can be performed with the L400 laser therapy device. It is used for surface treatments around the treatment area, for treating larger areas (wounds, eczema, psoriasis, etc.), and especially for treating areas with dark skin, dark hair follicles, pigmentation, and tattoos.
With the scanning technique, the laser optics are pressed into the skin and the laser is then moved in rectangular or circular movements on and around the affected area.
Treatment of wounds 
Wounds should be treated with skin contact of the laser optics along the wound edges (4J/cm²), using either the spot or scan technique. The area within the wound should be treated without skin contact of the optics (0.5-1J/cm²). Hold the L400 laser approximately 1 cm above the wound and treat using either the spot or scan technique.
Try it first, then buy! Want to try the Personal Laser L400 before you buy? For a rental fee, you can test the laser therapy device for 1 to 4 weeks . If you purchase a laser from our range at the end of the rental period, 50% of the rental fee will be credited.
Legal Notice: The statements on this product page regarding the possible applications of laser therapy and the expected effects are based on the experiences of users of LLLT laser therapy. This includes medical professionals (doctors, alternative practitioners, and physiotherapists), many of whom have been using LLLT devices in their practice for years.
With these descriptions of the PERSONAL-LASER™ L400, we do not intend to create the impression that using the device can guarantee an improvement in symptoms. No promises of a cure can be made. If you experience any symptoms, you should always consult a doctor first to discuss possible conventional medical therapies and alternative medical complementary options such as LLLT laser therapy.
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