The clinical approach
Four numbers decide what a machine can and can't do here: wavelength, pulse width, spot geometry, and fluence.
Wavelength picks the target. Selective photothermolysis, the principle Anderson and Parrish described in 1983, says you choose a wavelength your target absorbs more strongly than its neighbours, then keep the pulse short enough that the heat stays where you put it. At 1550nm the absorber is water in the dermis, so skin colour matters much less than it does with pigment-hungry wavelengths. At 10600nm water absorption is stronger by orders of magnitude, which is why a CO2 beam vaporises tissue rather than merely warming it. In the visible and near-infrared range, an IPL or E-light filter set works on a different pair of targets: our engineering archive records that light in the shorter visible band is absorbed by porphyrins that Cutibacterium acnes produces during its own metabolism, releasing singlet oxygen inside the organism, while longer filtered bands reach the vessels feeding an inflamed lesion.
Pulse width controls where the heat goes. Short pulses confine energy to the target. Long pulses let it bleed into surrounding tissue, which is sometimes what you want and sometimes exactly what you don't. E-light platforms in our range fire sub-pulse trains of 0.1-10.0ms with programmable intervals of 0.1-20.0ms between them, so heat accumulates in stages instead of arriving in one slug. That interval is your safety margin on Fitzpatrick IV and above. Fractional platforms sit at the other end: pulse widths of 0.067ms to 6.7ms on the 1550nm system, and 0.067ms to 0.67ms on the CO2 system.
Spot geometry is two knobs, not one. Manstein and colleagues published fractional photothermolysis in 2004: instead of resurfacing a whole field, you drop an array of microscopic treatment columns and leave untreated bridges between them as a healing reservoir. The CF-01 scanner gives continuously adjustable spot diameters from 50µm to 2000µm; on the EF-01 the spot is set by the lens cone fitted, so ask for it stated per cone rather than as one headline figure. Density steps run 6x6 to 24x24 spots per cm² — 36 to 576 spots, or roughly 1.56% to 25% fractional coverage — with each platform's steps listed on its specification table. Density sets coverage. Pulse energy, adjustable from 2mJ to 200mJ in 2mJ increments, sets column depth. Coverage governs downtime; depth governs how deep a scar you can reach.
Fluence is the number that gets quoted and misread. On an E-light handpiece it's energy density across the spot, 20-50J/cm² on the PE-01, with a 60mm x 15mm or 40mm x 8mm footprint. A big spot at moderate fluence covers a back in reasonable time. A small fractional spot at low pulse energy still delivers enormous local energy density, because the area it lands on is microscopic. Compare fluence only between comparable spot sizes, otherwise the comparison is noise.
Treatment protocol
Session spacing and what happens between visits
Plan a course. Active acne clearing with a light or E-light platform runs over several sessions spaced a couple of weeks apart, because you're managing an ongoing biological process rather than removing a fixed lesion. Our device documentation notes that acne marks treated with an E-light platform tend to surface within two to three days and settle over roughly one to two weeks, and it's explicit that white comedones must not be squeezed or cleaned out during that window. Fractional scar courses are staged too: our device manuals describe three to six sessions at three-to-four-week intervals, with atrophic acne scarring sitting at the long end of that range. Collagen remodelling after fractional work keeps developing for months after the last pass, so judging results at the two-week mark is premature.
Sequencing matters. Most operators clear and calm active disease first, then move to resurfacing once the skin has settled. Running a fractional laser across actively infected tissue invites trouble.
Where the real risk sits
Darker skin, mainly. Higher melanin load means a higher chance of post-inflammatory hyperpigmentation after any heat-based procedure, and ablative fractional work carries more of that risk than non-ablative. Conservative settings, a test spot, longer intervals, and strict broad-spectrum sun protection are the practical controls. Our PIH page covers the management side in more detail.
Screen before you fire. The manual for our 1550nm platform lists a specific contraindication set worth reading in full: recent botulinum toxin injection, recent RF or light treatment, prior ablative resurfacing within three months, dermal fillers in the treatment zone, uncontrolled diabetes, hypertension or cardiac disease, pregnancy, keloid tendency, and photosensitivity. Recent isotretinoin use deserves its own conversation with the prescribing clinician. The 2024 acne guidelines from the American Academy of Dermatology reserve oral isotretinoin for severe or scarring disease, so a meaningful share of the scar patients arriving at your door will have taken it recently.
Recommended equipment
Active acne: E-light plus deep cleansing
For inflamed Grade I to III disease, an E-light platform is the sensible workhorse. The PE-01 HPT E-Light carries five filter options, SR 530-1200nm, VR 585-1200nm, HR 610-1200nm, plus optional PR 560-1200nm and AR 430-1200nm, with 2.64MHz RF running alongside the light and contact cooling held between -2°C and 0°C. The MF-05 Multifunction E-Light shares the same filter set in a lighter 25.5kg cabinet, which suits a smaller room or a mobile setup. If your caseload is mostly acne and photorejuvenation rather than back-to-back hair removal, the MF-05 is usually enough machine.
Pore clearance is the underrated half of the protocol. Our archive puts the water and oxygen jet first in the recommended sequence for Grade I and II acne, and the reason is mechanical rather than optical: the OJ-01 Water Oxygen Jet produces mixture particles of 80µm or less at spray speeds up to 230m/s, fast enough to flush plugged follicles and lift necrotic debris before any energy device touches the skin. It runs off an air compressor and oxygen tank, so factor gas supply into your room plan.
Atrophic scars: 1550nm or 10600nm?
The EF-01 1550nm Fractional Laser is non-ablative: a 30W fibre source (10W and 20W configurations available) with random CPG scanning across 1x1, 2x2 and 3x3cm fields. Because water is the chromophore and the epidermis stays largely intact, downtime is short and the risk profile is friendlier on mid-range and darker skin types. Best fit is rolling and shallow boxcar scarring, texture, and pores.
The CF-01 CO2 Fractional Laser is ablative, 10600nm from an RF-excited source at 20W, 25W or 30W, delivered through a seven-joint articulated arm with sequential or randomised scanning and CW, UP and CPG operating modes. It reaches deeper icepick and older scarring the 1550nm can't, and it charges you for that in recovery time and PIH risk. Many clinics own both and stage them. Our scar treatment overview walks through the decision case by case.
What to check on acceptance
Ask for the safety file, not just the brochure. Laser equipment in this category falls under IEC 60601-2-22, the particular standard for surgical, cosmetic, therapeutic and diagnostic laser equipment, and the current edition dates from 2019. Confirm the CE technical documentation matches the model and power configuration you actually ordered, not a sibling unit. Check that supplied goggles carry an optical density rated for the specific wavelength; 1550nm goggles are useless in front of a CO2 beam and vice versa. Both fractional systems here are air cooled and draw from a standard AC 220V/50Hz or 110V/60Hz supply, with fuse ratings of Max5A on the EF-01 and Max10A on the CF-01. Consumables are modest: articulated arm mirrors and the scanner lens on the CO2 unit, cone tips on the 1550nm, disposable tips and solution on the oxygen jet. Ask what a replacement scanner lens costs before you sign, because that's where the surprise sits. Talk to us through the contact page if you want the full parameter sheets.
Frequently asked questions
Can one machine handle both active acne and acne scars?
Not well. The targets are different. Active lesions respond to filtered light aimed at bacterial porphyrins and inflamed vessels, plus mechanical pore clearance. Atrophic scars need controlled dermal injury from a fractional source to trigger collagen remodelling. A multifunction E-light platform can cover the first job and some pigment work, but it won't remodel a pitted scar. Clinics that treat volume acne generally run an E-light and an oxygen jet for the active phase, then add a fractional laser once the caseload justifies it.
How do I read spot density against pulse energy?
Think of them as coverage and depth. Density, stepped from 6x6 (36 spots) through 12x12 (144) to 24x24 (576) per cm² — roughly 1.56% to 25% coverage — is what fraction of the treated area you injure. Pulse energy, 2mJ to 200mJ, is how deep each individual column goes. High density with low energy gives you a shallow, wide treatment with more surface downtime. Low density with high energy reaches deep scarring while leaving more untreated skin as a healing reservoir. Deep scars usually favour the second combination, with more sessions.
Is fractional treatment safe on Fitzpatrick IV to VI?
With care, and with the right platform. Non-ablative 1550nm targets water rather than melanin, which is why it travels better across skin types than pigment-selective wavelengths. That doesn't make it risk-free; any thermal injury can trigger post-inflammatory hyperpigmentation. Conservative pulse energy, lower density, a test patch, longer intervals between sessions and disciplined sun protection are the controls that matter. Ablative CO2 work on darker skin belongs in experienced hands only.
What certification should I insist on before importing?
At minimum, a CE technical file referencing IEC 60601-2-22 for the laser systems, an electrical specification matching your local mains, and wavelength-rated eyewear shipped with the unit. Check your own regulator's import rules too, since several markets require separate registration for cosmetic laser devices regardless of what the CE mark covers. Get the serial number and configuration written into the invoice so the documentation and the crate agree when it lands.
References
- Manstein D, Herron GS, Sink RK, Tanner H, Anderson RR. Fractional photothermolysis: a new concept for cutaneous remodeling using microscopic patterns of thermal injury. Lasers Surg Med. 2004;34(5):426-438.
- Guidelines of care for the management of acne vulgaris. Journal of the American Academy of Dermatology, 2024.
- IEC 60601-2-22:2019 - Medical electrical equipment, Part 2-22: Particular requirements for basic safety and essential performance of surgical, cosmetic, therapeutic and diagnostic laser equipment.
- U.S. Food and Drug Administration - Medical Lasers (Center for Devices and Radiological Health).