Laser Hair Removal vs IPL vs SHR: What Is the Difference?

Laser hair removal uses a single, precise wavelength, such as 755 nm alexandrite or 1064 nm Nd:YAG, chosen for skin and hair type. IPL uses a broad spectrum of filtered flash light, which is less targeted. SHR is a marketing term for low-energy, rapid-pulse heating that may use either a diode laser or broadband light.

How does light remove hair at all?

All three approaches rely on the same idea, known as selective photothermolysis. Melanin, the pigment that colours hair, absorbs light and turns it into heat. If enough heat reaches the hair bulb and the stem cells near it, for long enough, the follicle’s ability to grow a new hair is reduced. The surrounding skin, which contains less melanin, should absorb less and stay undamaged.

The difficulty is that skin also contains melanin, especially in tanned or darker skin types. A good hair removal treatment therefore needs to put as much energy as possible into the hair and as little as possible into the skin. How well each technology manages that balance is the real difference between them.

What makes a medical laser different?

A laser emits light of a single wavelength in a defined beam. This precision means the energy can be matched to the target. At IN Eternity Clinic, laser hair removal uses the Lutronic Clarity II, which offers two wavelengths on one platform: 755 nm alexandrite, which melanin absorbs strongly and which suits finer hair on lighter skin, and 1064 nm long-pulsed Nd:YAG, which penetrates deeper and is absorbed less by skin melanin, making it the safer choice for darker skin types and deep, coarse hair.

Pulse duration, spot size, energy and cooling can all be set for the individual. That flexibility is why skin type is assessed by the doctor before the first session, and why settings may change across a course as the hair becomes finer.

What is IPL, and how does it compare?

IPL stands for intense pulsed light. It is not a laser. A flashlamp emits a broad band of light, and filters remove the shorter wavelengths so that what reaches the skin is roughly in the 500 to 1200 nm range. Some of that spectrum is well suited to hair; some is absorbed by skin pigment and blood vessels.

IPL can reduce hair, particularly dark hair on fair skin, and the same platforms are used for pigment and redness. The broader spectrum is the trade-off: the energy is less targeted, so in tanned or darker skin there is a greater chance of burns or pigment change at energies high enough to affect the follicle. Direct comparisons of low-fluence diode laser and high-fluence IPL in skin types III to IV, which include many Singaporeans, have been published, and they are a reminder that the light source and settings, not the name of the treatment, decide the balance between effect and side effects.

What is SHR?

SHR is usually expanded as super hair removal. It describes a way of delivering energy rather than a single type of light source: low energy per pulse, fired at a high repetition rate while the applicator is kept moving over the skin, so that heat builds up gradually in the follicle rather than arriving in one strong pulse. The approach was popularised with diode lasers, and the term is now also used for some broadband light systems.

The gradual heating is usually more comfortable and can be gentler on darker skin, and studies of low-fluence, high-repetition diode laser have shown hair reduction comparable to conventional settings. But because the label is used for different technologies, it does not tell you what the light source is. If you are offered SHR, it is reasonable to ask whether it is a diode laser or a broadband light system, and what wavelength is used.

Laser vs IPL vs SHR compared

Who operates the equipment, and how settings are chosen, matter as much as the technology itself.

How to choose

For most people in Singapore, the deciding factors are skin type and hair type. Dark, coarse hair on light to medium skin responds well to several technologies. Finer hair, tanned skin or darker skin types narrow the choice: a precise wavelength, chosen by skin type, gives more control over the balance between effect and safety. Very light, white or grey hair responds poorly to any light-based method, and electrolysis is the alternative.

Hormonal conditions such as polycystic ovary syndrome can drive new hair growth and make results slower; these are discussed at assessment. Intimate areas such as the bikini line and Brazilian area need careful settings, and a female doctor can be arranged on request at IN Eternity Clinic.

Whichever method is used, a course is needed because hair grows in cycles and only actively growing hairs respond well. Sessions are typically spaced four to eight weeks apart depending on the area, and progress is reviewed as the hair thins and lightens.

What does it feel like, and what are the risks?

Laser hair removal feels like a quick snap or flick against the skin with each pulse, softened by cooling; sensitive areas such as the upper lip and bikini line feel sharper. Gradual in-motion heating is often described as warmth building up. Numbing cream can be used for sensitive areas.

Redness and small raised bumps around the follicles are common for a few hours. Less common risks include blistering, burns and temporary darkening or lightening of the skin, more likely with recent sun exposure or a tan. Sun protection, avoiding tanning and stopping waxing or plucking before the course all reduce risk, because the hair needs to be present in the follicle for the light to work.

Some medicines and conditions change the plan. Photosensitising medicines, recent isotretinoin, a history of cold sores in the area, keloid scarring and pregnancy are reviewed beforehand. Tattoos and dark moles in the treatment area are covered or avoided, because their pigment absorbs the light as strongly as hair does.

Common myths, answered

• Myth: IPL is a type of laser.
  Fact: IPL is a flashlamp that emits broad-spectrum light. A laser emits a single wavelength in a defined beam.
• Myth: SHR is a specific machine.
  Fact: SHR describes a low-energy, rapid-pulse way of delivering heat. Different systems use it, with either a diode laser or broadband light.
• Myth: Laser hair removal removes every hair for good.
  Fact: The realistic aim is a lasting reduction in hair count and finer regrowth. Some hairs persist, and maintenance sessions may be needed.
• Myth: Darker skin cannot have laser hair removal.
  Fact: With a suitable wavelength such as 1064 nm and careful settings, many darker skin types can be treated. Skin type is assessed first.