Light Therapy
An LED phototherapy device emits light at defined wavelengths through an array of diodes placed close to the skin. Unlike the light-based hair removal systems in the same range, it delivers low-intensity light continuously rather than in pulses, and it does not emit ultraviolet.
This category covers professional units for cabin use and the protective eyewear that goes with them. It sits within the wider range of professional beauty equipment. What a given protocol involves, for whom it is suitable and what it can achieve are determined by the practitioner in line with their training and the manufacturer's documentation.
Wavelengths and colours
An LED unit is defined by the wavelengths it emits, stated in nanometres. The colour is the visible expression of that figure, and each is a different specification rather than a different intensity of the same thing.
| Colour | What it is | Where it appears |
|---|---|---|
| Red | Longer wavelength within the visible range | Standard on almost every unit |
| Blue | Shorter wavelength within the visible range | Standard on almost every unit |
| Violet or combined | Red and blue diodes operating together | Units offering combined modes |
| Near infrared | Beyond the visible range | Higher-specification panels only |
What to check on the data sheet is not the colour name but the wavelength in nanometres and its tolerance. Two units described as "red" may emit at different figures, and the manufacturer states which. Where a unit offers combined modes, it is worth confirming whether the colours run simultaneously or in sequence.
Irradiance is the specification that separates units
This is the figure that distinguishes a professional device from a consumer one, and it is the one least often published.
Irradiance is the light power delivered per unit of area, stated in mW/cm², and it only means anything when accompanied by the distance at which it was measured. A figure quoted without a distance is not comparable: the same panel measured at 5 cm and at 20 cm gives very different numbers.
The practical consequence is that the working distance is part of the specification, not a detail of use. A panel designed to sit at a given distance from the face delivers its stated output at that distance and considerably less further away, which is why the arm or stand that positions the unit matters as much as the panel itself.
Where a manufacturer publishes irradiance with its measurement distance, that is the unit to compare. Where it publishes only a diode count, the diode count on its own says little.
Masks and multifunction units
The catalogue covers two formats, and they suit different ways of working.
A face mask is a contoured array worn over the face, which keeps a constant distance across the whole surface without the practitioner holding anything. It frees the operator during the session and is the format that fits a protocol where the LED phase runs while other preparation happens.
A multifunction unit integrates LED with other technologies in one cabinet — commonly with radiofrequency and EMS — which occupies a single footprint and shares a power supply. The trade-off is the one common to all combined equipment: a fault in one module can take the whole cabinet out of use.
LED service life and output over time
LEDs do not fail suddenly. They dim.
Manufacturers state a rated life in hours, at the end of which output has dropped to a defined percentage of the original. The unit still switches on and still looks the same, which is what makes this different from a lamp that simply stops working: a panel past its rated hours is delivering less than its specification while appearing to work normally.
In a cabin running the device daily, that figure translates into years of service, and it is worth knowing before comparing two units. It is also worth confirming whether the panel or mask is replaceable as a separate reference or whether the whole unit is replaced when the array degrades.
Eye protection
Protective eyewear is used with LED units, and it is specific to the wavelengths emitted: goggles intended for one type of equipment do not necessarily protect against another.
Where several light-emitting devices share a room — LED panels alongside IPL and laser hair removal systems — matching the eyewear to each machine rather than keeping one general pair is the point that matters. Each manufacturer states the wavelength range its eyewear covers.
Where LED sits in a facial protocol
LED phototherapy is usually the closing phase of a sequence rather than a standalone service, which is why the cabin is equipped as a set.
Facial steamers open the protocol, skin peeling equipment covers the exfoliation phase, and mesotherapy devices the application phase.
Because the devices are used one after another on the same client, bench space and the number of sockets constrain the protocol as much as the equipment. An LED mask in particular needs somewhere to rest and to be cleaned between clients.
Power supply and installation
Professional beauty equipment is largely manufactured in continental Europe, so a unit may be supplied with a European Schuko plug rather than a UK three-pin BS 1363. Confirming the plug type with each model and arranging an adaptor or a fitted UK plug in advance avoids a device standing idle on its first day.
LED units draw less than most equipment in the cabin, but where several devices share the same wall the combined load is what the socket circuit has to support.
What to check before buying
Six points from the data sheet:
- Wavelengths in nanometres, with their tolerance, rather than colour names
- Irradiance in mW/cm² and the distance at which it is measured
- Whether colours run simultaneously or in sequence on combined modes
- Rated life in hours and the output level at the end of it
- Whether the panel or mask is replaceable as a separate reference
- Plug type, and eyewear matched to the wavelengths emitted
Professional phototherapy equipment is intended for use by trained operators. Treatment protocols, session planning, client suitability and any precautions are determined by the practitioner, and each manufacturer states the operating conditions and limitations for its device in the accompanying documentation.
Frequently asked questions
What is LED phototherapy equipment?
A device that emits light at defined wavelengths through an array of diodes placed close to the skin. Unlike light-based hair removal systems, it delivers low-intensity light continuously rather than in pulses, and it does not emit ultraviolet. It is used in facial protocols in salons and clinics, with the application determined by the practitioner.
What do the different colours mean?
The colour is the visible expression of the wavelength, stated in nanometres, and each is a different specification rather than a different intensity of the same thing. Red and blue are standard on almost every unit; combined or violet modes run red and blue diodes together; near infrared appears on higher-specification panels. What to check is the wavelength figure and its tolerance rather than the colour name, because two units described as red may emit at different figures.
What is irradiance and why does it matter?
Irradiance is the light power delivered per unit of area, stated in mW/cm². It only means anything when accompanied by the distance at which it was measured: the same panel measured at 5 cm and at 20 cm gives very different numbers. That makes the working distance part of the specification rather than a detail of use, and it is the figure that distinguishes a professional device from a consumer one.
How long does an LED panel last?
LEDs do not fail suddenly, they dim. Manufacturers state a rated life in hours, at the end of which output has dropped to a defined percentage of the original. The unit still switches on and looks the same, so a panel past its rated hours delivers less than its specification while appearing to work normally. It is worth confirming whether the panel or mask is replaceable as a separate reference.
Mask or multifunction unit?
A face mask is a contoured array worn over the face, which keeps a constant distance across the whole surface and frees the operator during the session. A multifunction unit integrates LED with other technologies in one cabinet, occupying a single footprint and sharing a power supply, with the trade-off that a fault in one module can take the whole cabinet out of use.
Is eye protection needed with LED equipment?
Protective eyewear is used with LED units and is specific to the wavelengths emitted: goggles intended for one type of equipment do not necessarily protect against another. Where several light-emitting devices share a room, matching the eyewear to each machine rather than keeping one general pair is the point that matters, and each manufacturer states the wavelength range its eyewear covers.
Does the equipment come with a UK plug?
Professional beauty equipment is largely manufactured in continental Europe, so a unit may be supplied with a European Schuko plug rather than a UK three-pin BS 1363. It is worth confirming the plug type with each model and arranging an adaptor or a fitted UK plug in advance. LED units draw less than most equipment in a cabin, but the combined load of several devices on the same wall is what the socket circuit has to support.
Who can operate professional LED equipment?
Professional phototherapy equipment is intended for use by trained operators. Treatment protocols, session planning, client suitability and any precautions are determined by the practitioner in line with their training. Each manufacturer states the operating conditions and limitations for its device in the accompanying documentation, which is the reference for use.