A notebook of successful settings looks like a shortcut to confidence: treatment area, number, senior signature. But a number does not reveal the device, spot size, baseline skin or delayed response. Note-taking is useful only when it becomes a reasoning journal rather than a recipe book.
Every number belongs to a specific system
The same unit on two platforms does not guarantee the same light delivery. The wavelength or spectrum, spot size, pulse duration, profile, calibration, attachment and cooling method are important. Even within the same model, configurations may vary.
Documentation therefore begins with exact identification of the device and handpiece, not with the treatment area. If that link is missing, a setting cannot be applied safely. The manufacturer's IFU and approved protocol take precedence over a personal notebook.
- Device model, serial or internal asset ID and attachment.
- Spot size, pulse duration and selected mode.
- Type and state of cooling.
- Treatment area, segment, hair diameter and colour.
- Skin condition, recent sun exposure and baseline photographs taken according to protocol.
- Immediate response and results within an agreed observation window.
Describe the original clinical task
The axilla is not a homogeneous area. Hair density and diameter, pigmentation and sensitivity may differ between the centre and the margins. Writing “good result in the axillae” hides these differences and does not explain what was actually assessed.
Before recording parameters, document the observed skin and hair, previous response, interval and actual regrowth. Medical issues are documented only within the practitioner’s scope and referred for evaluation where necessary. The purpose of the entry is not to diagnose, but to preserve the context for the decision.
Link each action to the observed response
The setting makes sense only in conjunction with what the practitioner observed during and after the test patch. Describe specific signs and sensations, when they appeared, the cooling and the reason for any pause. The word “normal” is too vague for the next visit.
Delayed results are also needed: the shedding pattern, regrowth in segments, adverse events and compliance with care. If there is no feedback, the record remains incomplete. Good immediate tolerability in the first minutes does not prove effectiveness and does not exclude a later event.
Do not turn an average into a universal norm
After several similar cases, it is easy to draw a favourite range and call it a standard. But the choice depends on the specific system, skin, hair, area and history. The journal helps you see a pattern rather than cancelling a fresh assessment before each session.
It is especially dangerous to copy a line just because two clients have the same phototype or treatment area name. The phototype category does not measure all pigmentation, and the name does not describe the thickness of the hair. The question to the student is: which conditions matched and which did not?
Use the journal to generate questions
During supervision, select an entry and conceal the settings column. The student first proposes a plan based on the available information, constraints and protocol. They then compare it with the actual decision and discuss the differences. This teaches the trainee not to guess at a number, but to explain their reasoning.
The notebook should contain corrections and versions, not a polished retrospective narrative. If the device is serviced, the protocol is changed, or an attachment is replaced, the old lines are marked with context. A good journal does not direct the practitioner’s hand; it prompts more precise questions.
Key takeaways
- A setting has meaning only within a specific device and configuration.
- Document the baseline skin, hair and segment alongside the setting.
- Immediate response and delayed outcome complete the record.
- A reasoning journal supports, but never replaces, protocol and current assessment.
Sources and scope of use
- Selective photothermolysis: precise microsurgery by selective absorption of pulsed radiation, Science / National Library of Medicine. Use to explain the foundational principle of selective photothermolysis. Do not derive settings for modern devices directly from this foundational paper.
- On the physics of laser-induced selective photothermolysis of hair follicles: influence of wavelength, pulse duration, and epidermal cooling, Lasers in Surgery and Medicine / National Library of Medicine. Use to explain the relationship between wavelength, pulse duration and cooling. Do not publish experimental values as a universal settings formula for different devices.
- Treatment Guidelines for the Use of Laser and Intense Pulsed Light Devices for Hair Reduction and Treatment of Superficial Vascular and Benign Pigmented Lesions, British Medical Laser Association. Use for consultation, informed consent, test spots, documentation, eye protection, aftercare, equipment checks and incident escalation. Adapt to current local law and the manufacturer's exact instructions.
- Safety Information for Lumenis Energy-Based Devices, Lumenis. Use only as an example of warnings, test spots and contraindications for this device family. Before any clinical decision, check the current IFU for the exact model and the requirements of the relevant jurisdiction.
- 510(k) Summary: GentleMAX Family of Laser Systems, K140122, U.S. Food and Drug Administration. Use to define the FDA term 'permanent reduction in hair regrowth' and the authorised indications for this device family. Do not transfer those indications to other devices.
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