The technology
A hair-removal laser produces coherent light — a single wavelength aimed with precision at melanin in the hair follicle. Different wavelengths are chosen for different skin types (e.g. 755nm Alexandrite for lighter skin, 1064nm Nd:YAG for darker skin), which is why clinical laser is calibrated to each patient.
IPL — intense pulsed light — is not a laser. It emits a broad spectrum of visible light (roughly 500–1200nm) that scatters across the skin. Some of it hits the follicle; much of it is absorbed by surrounding pigment, which is why IPL is riskier on darker skin and less effective overall.
| Attribute | Medical Laser | IPL |
|---|---|---|
| Light source | Single-wavelength laser | Broad-spectrum flashlamp |
| Energy per pulse | Clinical (up to 60+ J/cm²) | Consumer 5–10 J, pro up to ~20 J |
| Skin-type calibration | Adjusted per session | Limited or fixed |
| Safe on Fitzpatrick V–VI | Yes (with Nd:YAG) | Rarely |
| Sessions to permanence | 6–10 | 20–40+, results temporary |
| Long-term result | Permanent reduction | Reverts when stopped |
Energy and permanence
Permanent follicle destruction requires energy density above the follicle's thermal damage threshold. Clinical devices routinely deliver 30–60 J/cm² tuned to the patient's tissue. At-home IPL is capped at consumer-safe levels — typically 5–10 J/cm² — which is enough to slow the growth cycle temporarily but not enough to permanently disable the follicle.
That is why IPL results fade. The follicle recovers, and hair returns to baseline within months of stopping use.
Skin type and safety
Because IPL scatters across a broad spectrum, more of its energy is absorbed by melanin in the surrounding skin. In Fitzpatrick IV–VI skin, this raises the risk of burns, blistering, and post-inflammatory hyperpigmentation.
Clinical laser sidesteps this by choosing wavelengths that pass more cleanly through pigmented skin — most notably the 1064nm Nd:YAG, which is specifically indicated for darker skin. Stubble treats all Fitzpatrick types safely because clinicians can select the right wavelength and cooling for each patient.
At-home IPL devices
At-home IPL has a legitimate role — as a maintenance tool for patients who have already completed a clinical laser cycle and want to touch up the occasional stray hair. As a primary hair-removal solution, it under-delivers.
- ·Effective only on light skin with dark, coarse hair
- ·Requires 2× weekly use for 12+ weeks, then ongoing maintenance forever
- ·Cartridges and lamps degrade and need replacement
- ·Easy to miss spots without professional precision
Long-term cost
| Timeframe | Laser (full cycle) | At-home IPL |
|---|---|---|
| Upfront | $1,500 | $300–$600 |
| 3 years | $1,500 total | $600–$900 |
| 5 years | $1,500 total | $900–$1,400 |
| 10 years | $1,500 total | $1,600–$2,400 |
Cost note
Key takeaways
- · Laser uses one focused wavelength; IPL uses a broad spectrum of scattered light.
- · IPL is capped at consumer-safe energy and produces temporary thinning, not permanence.
- · Only certain professional lasers (e.g. Nd:YAG) are safe for Fitzpatrick V–VI skin.
- · At-home IPL is a maintenance device — not a replacement for a clinical cycle.