What is a therapeutic LED?
A therapeutic LED is a diode that emits low-intensity red (≈ 630 nm) or near-infrared (≈ 850 nm) light. Unlike lasers, its beam is not coherent; hundreds of diodes positioned side by side create a homogeneous light field capable of covering a larger area such as an entire face, back or thigh. LED phototherapy has made a name for itself in aesthetics, pain relief and sports recovery thanks to its excellent safety profile.
How does LED light work?
The different effects of LED light on cells :
Mechanism
Chromophore uptake (grouping of atoms with one or more double bonds), nitric oxide release, cytokine modulation, fibroblast stimulation.
Cellular effect
Increased ATP, available energy, micro-capillary vasodilation, reduced inflammation, reduced pain, increased collagen, increased elastin.
Visual and sensory results
Brighter complexion, more reactive muscles, dewy skin, improved tissue oxygenation, relieved joints, soothed redness, smoothed wrinkles and softened scars.
Key parameters for an effective LED session
After a quick cleansing of the area to be treated, the practitioner positions the panel 5 cm from the skin. The session lasts around 15 minutes, with no burning sensation, just gentle heat. The person being treated wears an openwork eye mask (no need for UV protection, but visual comfort is assured). Here are a few points to bear in mind for an optimal LED session:
1.
Color
Red 630 nm for the epidermis, near infrared 850 nm for muscles.
2.
Fluence
Aim for 6 to 12 J/cm² to trigger cell response without over-stimulation.
3.
Power per unit area
35-50 mW/cm² over the target area.
4.
Duration
10 to 20 minutes per session, depending on the surface.
5.
Frequency
2 sessions per week in the initial phase, then 1 weekly maintenance session.
Major aesthetic indications and pain management
The benefits of LED light on skin and pain management.
Sports recovery
Post-exercise exposure to therapeutic infrared LEDs reduces soreness (DOMS) and shortens recovery time by 25%.
Joint pain
Osteoarthritis of small joints, mild low back pain: LED phototherapy reduces pain intensity as early as the fourth session.
Androgenetic alopecia
Red LED masks or helmets stimulate hair follicles and extend the hair growth phase, promoting denser hair.
Wrinkles and loss of firmness
Red light boosts collagen synthesis, the dermis becomes denser and fine lines fade.
Complexion radiance and texture
By boosting microcirculation, LED photobiomodulation evens out skin tone and tightens skin texture.
Inflammatory acne and scars
Red wavelengths modulate bacterial proliferation, while LEDs complete the antiseptic action. Photons accelerate the remodeling of collagen fibers, making marks and stretch marks more supple and less visible.
Choosing the right LED device
What are the main differences between LLLT lasers and LED light?
Professional panel
Surface area > 600 cm², high power, precise settings: ideal for aesthetic practices and physiotherapy.
Flexible face mask
Ergonomic, lightweight format: perfect for wrinkles, acne and skin radiance.
Hands-free dome
Head, neck and shoulder cover: useful for post-operative care or hair regrowth.
Portable lamp
10 × 10 cm spotlight, built-in batteries: at-home maintenance between two pro sessions.
Safety, standards and best practices
PBM devices must comply with very precise safety standards and must be handled with care:
Marking
CE medical mark or FDA 510(k) for professional use.
Hygiene
Maintain good hygiene by cleaning panels with an alcohol wipe after each visit.
Protection
Protect the eyes of light-sensitive patients with the masks and goggles supplied.
Contraindications
Retinoids, active cancer lesions, pregnancy.
Maintenance
Annual control of light output by professionals to ensure constant luminous flux.
Integrating LEDs into a global protocol
In sports massage, an infrared LED session before manual work prepares muscles, reducing the pressure required and residual pain. At home, a 10-minute LED mask after evening cleansing intensifies the effectiveness of serums and creams.
depth of forehead wrinkles measured by profilometry after 8 weeks.
hair density in subjects treated 20 min a day, 3 times a week, for 12 weeks.
joint pain score (on the VAS scale) on 40 patients suffering from chronic tendinitis.
