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Professional Guide: 14 modules (digital manual in Spanish, French and English) UV technology UV hair extensions: how they work Hair compatibility Benefits for professionals Application and removal guide UV extension masterclasses Masterclass: dates and terms Become a distributor UV extension advice More frequently asked questions Buy the kitThe science behind the EHE LIGHT™ system
Photoinitiator chemistry calibrated to 395 nanometres. Curing in a few seconds, at room temperature, with no heat applied to the hair.
“Where heat creates risk, light creates precision.”
At the heart of the EHE LIGHT™ system is carefully calibrated photoinitiator chemistry. When the EHE LIGHT™ UV adhesive is exposed to the device’s 395 nanometre wavelength, a chain reaction is triggered at the molecular level: the photoinitiator compounds absorb UV photons and generate free radicals that instantly catalyse the curing of the adhesive, creating a solid, cross-linked polymer network.
In practice, the adhesive changes from a workable liquid, which gives you time to position each strand precisely, to a rigid yet flexible solid through 6 to 8 seconds of UV curing on top and 6 to 8 seconds underneath, holding the light within 1 cm of the bond point. The result is a mechanically robust bond that withstands daily washing, styling and physical activity, but is chemically designed to weaken in a controlled way with the EHE LIGHT™ removal solution and professional heat activation.
The 395 nm wavelength sits in the long-wavelength UV-A spectrum. The safety shield built into the EHE LIGHT™ device is designed to limit unnecessary UV exposure for the hairdresser and the client during the curing protocol, on top and underneath.
The chemistry, explained
Traditional keratin adhesives are applied at between 160°C and 200°C. At these temperatures, the disulphide bonds in the hair can break, the cuticle layer is damaged and internal moisture evaporates. Over time, this leads to brittleness and cumulative breakage. UV curing removes this risk entirely: the adhesive hardens at room temperature, preserving the structural integrity of the hair.
The 395 nm UV-A wavelength offers a good balance between penetration depth and photoinitiator efficiency. Shorter wavelengths (below 365 nm) cure faster but carry more energy, which can damage organic materials. Longer wavelengths (above 400 nm) move into the visible spectrum and cure too slowly. At 395 nm, EHE LIGHT™ achieves complete, even curing when you work within 1 cm, with 6 to 8 seconds of exposure on top and 6 to 8 seconds underneath.
Once cured, the EHE LIGHT™ polymer is designed to follow the natural movement of the hair rather than form a rigid, brittle nodule. This is achieved with a specific monomer-to-cross-linker ratio, which produces a semi-rigid, elastomeric matrix. The practical benefit is that the bond moves naturally with the hair, which reduces the mechanical stress behind premature detachment.
The EHE LIGHT™ removal solution is a solvent system formulated specifically to penetrate the cured polymer network and make it swell. Applied directly to the adhesive, then followed by professional heat activation of the bond point at 120°C, the matrix weakens in a controlled way. The EHE LIGHT™ removal tool then slides cleanly through the softened adhesive and releases the strand without excessive pulling or abrasion.
Technical specifications
A 5 W USB-powered device, calibrated to a single wavelength and designed for a precise curing protocol. Nothing superfluous, nothing missing.
Safety and certifications
The EHE LIGHT™ device is certified CE, RoHS and FCC: the three main regulatory markings required for professional electronic devices in the European Union, the United Kingdom and international markets. It operates in UV-A at 395 nm. The built-in safety shield contributes to the client’s comfort and adds a layer of protection during the curing protocol, on top and underneath. Read the instructions supplied before first use.
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