The Myth That 6J Is Weak in GentleMax Toning (24mm Spot Size)

GentleMax Toning,

The Myth That 6J Is Weak (24mm Spot Size)

Check This Before You Read On

Q. Is 6J weak and 10J strong

for GentleMax Toning?

A. No. When the spot size is different,

the same joule value delivers a completely different output.

Q. So how do you actually compare procedure intensity?

A. You need to look at both the joules

and the spot size in millimeters together.

The Bottom Line.

With GentleMax Toning, intensity is only determined

when you consider both joules and spot size together.

Where the Difference Lies.

Even at the same joule value, the outcome varies

depending on whether you're using a 24mm, 20mm, or 16mm spot.

What We're Covering Today.

How to evaluate whether the settings recorded

in your chart are truly appropriate for you.

GentleMax Toning —

How Is It Different from Regular Laser Toning?

GentleMax Toning is a pigment and vascular procedure that uses

two wavelengths — Alexandrite 755nm and Nd:YAG 1064nm —

selectable from a single device.

What's commonly referred to as "laser toning"

typically means low-energy multi-pulse delivery at 1064nm.

GentleMax adds the 755nm wavelength to that,

allowing us to address superficial spots, melasma, moles,

and even fine vascular concerns — all from one platform.

The key distinction is that the two wavelengths penetrate to different depths.

755nm works more effectively on superficial epidermal melanin,

while 1064nm is better suited for dermal pigmentation and vascular targets.

GentleMax Toning —

Why You Can't Just Look at 6J?

Dr. Wi Young-jin's

Key Clinical Insight

In GentleMax Toning,

6J does not mean weak.

At a 24mm spot, 6J delivers

nearly the same output as 10J at 20mm.

If you only look at joules without accounting for spot area,

your comparison of procedure intensity will be completely off.

"The clinic down the street uses 10J —

why are you only doing 6J here?"

I get this question all the time.

But you actually need to think about it in reverse.

6J doesn't mean it's weak.

The spot sizes most commonly used with GentleMax are

24mm, 20mm, and 16mm.

Even at the same joule value, as the spot size decreases,

the energy per unit area (fluence)

increases sharply.

Spot area scales with the square of the radius, after all.

The area ratio between 24mm and 20mm

is approximately 1.44 times.

That means 6J at 24mm and 4.2J at 20mm deliver

nearly the same fluence per unit area —

and 10J at 20mm is equivalent to roughly 14J when converted to a 24mm spot.

That might come as a surprise.

Last week, a 46-year-old patient came in with her mother,

but ended up being the one who needed the consultation more urgently.

"I've been doing toning sessions for six months somewhere else,

and nothing has changed."

When she showed me her chart, the settings were 5J at 24mm.

The energy was below the melanin breakdown threshold —

so sessions were accumulating without any real effect.

I narrowed the spot to 20mm and adjusted the joules to 7–8,

and by the third session, her skin tone started to visibly shift.

The sign of appropriate energy is straightforward.

It's not immediate redness right after the procedure —

it's a mild flush that appears a few minutes later.

If redness appears immediately, the energy is too high.

If there's no reaction at all, you're below the threshold.

That balance cannot be calibrated by joule numbers alone.

Dr. Wi Young-jin's Key Takeaways

• When you receive your chart,

  always check the millimeter value alongside the joule number.

• 6J at 24mm and 6J at 16mm

  should be considered entirely different procedures.

• When comparing with another clinic,

  both numbers need to be documented together for the comparison to be meaningful.

GentleMax Toning —

Which Wavelength Is Used for Which Pigment?

This is the real reason we use a dual-wavelength device.

The choice of wavelength needs to vary

based on the depth and type of pigmentation.

There's something important I always want patients to understand:

if you've had 4 to 6 toning sessions with minimal results,

adding more sessions is not the answer.

That's a signal that your settings are below the effective threshold.

In those cases, combining pico toning or brightening agents

alongside toning is often necessary.

That said, GentleMax Toning remains an excellent starting point

for addressing baseline pigmentation.

GentleMax Toning Settings —

Three Questions I Hear Most Often in the Clinic

Q1. Isn't 10J always more effective

than 6J, no matter what?

This one is clear-cut.

Comparing joule values without spot size is meaningless.

Since 6J at 24mm and 10J at 20mm deliver nearly the same output,

your chart needs to include both the joule value and the spot size

for any comparison to be valid.

Even at the same joule level, dropping to a 16mm spot

increases both discomfort and the risk of adverse reactions.

Q2. If you only compare joules when evaluating cost per session,

are you getting a bad deal?

I want to address this directly, because overlooking it often leads to regret.

Generally, a single toning session runs

approximately 150,000–300,000 KRW depending on area and scope,

with 5-session packages typically ranging from 600,000–1,000,000 KRW.

Yet every month, two or three patients leave saying "the other clinic is cheaper

and uses higher joules" — then come back six months later.

The spot size was larger, meaning the fluence per unit area

was below the effective threshold.

If sessions are cheaper but produce no visible change,

they end up being the most expensive option of all.

Q3. If I feel very little stinging during the procedure,

does that mean it's not working?

I get this question outside the clinic too —

friends ask me the same thing.

With toning, energy is fractionated through multi-pulse delivery,

so minimal discomfort is completely normal and expected.

A 29-year-old patient came in with a friend and said,

"My friend said it stings, but I don't feel anything — should I be worried?"

She was on a 24mm, 7J setting,

while her friend had been treated with 16mm.

The correct indicator isn't Pain —

it's the mild Erythema that develops a few minutes after the procedure.

GentleMax Toning is not a procedure

where a single joule number tells the whole story.

Without the spot size in millimeters, that number is only half the picture.

In my next post, I'll break down

what to do when your skin tone hasn't improved after 6 toning sessions —

and how to adjust your settings accordingly.

There are specific criteria for deciding whether to add more sessions

or switch to a different wavelength.

This has been Dr. Wi Young-jin.

Further Reading

• GentleMax: Is There a Difference Between a Dermatology Clinic and a Laser Hair Removal Shop?

• Beard Hair Removal with GentleMax: Why More Sessions Alone Won't Cut It

• "Are You Choosing a Laser Hair Removal Device Based on Name Alone?" — Why GentleMax Pro Plus Is Worth the Investment