HOME       cello      cubic 7      heads       power      design studio      results     microcurrent      articles     contact



Cubic 7:  5 Minutes.  Done.
Or 9 Minutes with our new Cello Wand System.

With just one DermaWave Planar Head, pushing over 32 square inches of light, just place at three locations.  No, we're not kidding.


But, for us, it was never about rushing the Spa client out the door in 5 minutes (our co-founder owned her own Day Spa for 19 years). Rather, we wished to provide the most punch within any given time - that which we achieved back in 2001 (seems so distant, doesn't it?), when our original DermaWave PL-100 / Revision II hit the market ...

And with our massive Planar Heads, you now have the extra time to employ additional services in addition to Photo Rejuvenation within, say, a 30 minute visit (as longtime Spa owners, we know that clients don't like being left 'unattended' for 30 minutes under an inefficent panel. They want you there). But there's more to it than our heads employing the highest output LEDs currently available.

Duty Cycle: What They Don't Want You to Know - Or Even Know Themselves ...

Did you know that virtually all pulsed-LED machines don't work half of the time? ... Let's rephrase that ... They're OFF half of the time as an innate result of an engineering principle known as 'Duty Cycle'. It may be useful to consider that, for every 'pulse', there are two phases: an On Phase ... and an Off Phase between any two 'On' pulses. The duration of the 'On' phase is referred to as a 'Duty Cycle' and is represented as a percentage of the two phases, On and Off. Commonly ... in fact, in virtually every LED pulse machine made, the Duty Cycle is 50% whereby the LEDs are on half of the time ... as well as being off half of the time. Despite one study citing a 50% Duty Cycle as 'best' for collagen reproduction, this would only be at the specific wavelength used in that study. With other wavelengths - even only slightly higher or lower, the 'math' changes. The fact is, the 'On-Off, 50% Duty Cycle' is the most common type of pulse circuit (used in several other applications - such as simple bicycle-flashers, outside of Photo Rejuvenation), is easy to engineer, is relatively inexpensive to produce and is further available to manufacturers as a ready-made, off-the-shelf circuit. Thus its popularity with machine makers. The path of least, no-fuss resistance ... with reduced production costs -- even if the actual performance is compromised.

And, by the way -- as erroneously reported on other sites -- LEDs, themselves, do not have a 50% Duty Cycle, innately -- or even an 85% Duty Cycle as another site incorrectly reports. LEDs, in fact, have no duty cycle of their own. It's the circuit to which the LEDs are mated that determines such. The same is true of solid-state lasers, by the way -- and neither is "less capable" of delivering a given Duty Cycle than the other when connected to a circuit that actually defines the parameters. Any well-versed high school Electronics student will tell you this. With regret, many people in this industry -- perhaps most, it often seems -- know less than that high school student -- by their own example ...

Of greater importance is Pulse Width calculated with Pulse Frequency, orchestrated with the selected Wavelength. That is, it's an interacting, three-part equation. Pulse Width / Pulse Frequency / Wavelength. So anyone claiming an inate 'superiority' of any one specification can be safely ignored. There is no 'one correct answer'. In fact, if one were to plug in a DermaWave Blue Head into the control console, the modulation parameters are adjusted because the wavelength has now been changed. The three-part equation must (should) be altered.

In any event, would you like to see the difference in Duty Cycle be expressed in another way -- in 'Real Time'? Okay ... We're going to slow two, side-by-side pulses way down -- to only one pulse per second -- so your eyes can readily see the difference, as well as to operate within the "refresh rate" limits of your computer monitor ...

Pssst ... If you don't see the squares below flashing that means you took awhile to
get here. They pulse for 16 minutes, then stop. To make them flash again, reload page.


Common LED Machines    |    dermawave machines

Duty Cycle
at 1 Second Interval


DermaWave Duty Cycle
at 1 Second Interval

Okay, don't expect the two pulses to be entirely synchronized with one another as your Internet connection may load the images and start the sequences at a somewhat different time. But both full pulse sequences, comprised of both On and Off cycles, are lasting for one second, total -- before the next pulse sequence begins. It may be easier to view one pulse sequence at a time -- first the one on the left, with a 50% Duty Cycle -- being off (or 'black') half of the time ... And then view the pulse on the right (ours), Said another way, if your computer was a Photo Rejuvenation machine (don't you wish?), the pulse light to the right is giving your face 85% more exposure. Again, we're showing you the difference at a very slow rate of only one pulse per second for demonstration purposes, but the theorem remains constant at any and all pulse rates, fast or slow.

This 'Micro-Long-Pulse'  technology (far fast erthen the eye/mind can perveive) is a DermaWave exclusive that yields an output efficiency far greater than others ... pretty much name it.

The Joke of Joules & Other Parameters ... We may get around to devoting an entire article to this in the near-future, but in the interim ... If you were a device manufacturer that employed LEDs in your design (such as we do), and you were to order LEDs in the raw from the Opto-Electronics industry that produces them, requesting a particular 'joules' specification, you'd be greeted with ..... a blank stare. Why? Because no matter what you've heard or have even read in 'skin magazines' (principally filled with articles submitted by those associated with distributors, posing as objective and unbiased writers - with the magazine's full knowledge), LEDs aren't typically measured in 'joules'. (Read that again, if you must). Lasers, okay (related to a 1 second constant).   IPL flashlamps, yes (related to a 1 second constant, as well).   LEDs ... ummm, not so much. This, because a joule rating can be so wildly and creatively fudged as it relates to LED output, all while generously presented with entirely incomplete and misleading information that allows for most any number or rating of one's choosing. There's more to the story, you see. There usually is ...  Give us one photorejuvenation device - any one - and we can provide you with a variety of 'joule' ratings and specifications. It all depends on ...

  • How one measures the output, whether in real-world terms or through theoretical calculation.

  • How one works the math ... and ...

  • How one presents the math.

As you might imagine, most who try to sell you a device by the Numbers Game, do so by choosing the most 'favorable light' (no pun) that provides the highest numerical value.

Ways to Fudge include ...

  • Relate the rating to 'white light', rather than the actual narrowband wavelength employed in the LED.

  • Relate the specification to a steady-state emission, rather the pulsed duty cycle actually provided by the device's driver circuit (remember the 50% thing?)

  • Expand the time constant for the stated output.

  • Don't relate output to surface area, working in concert with ...

  • State the sum total of all LEDs in the array (even though they don't actually hit the surface in this aggregate fashion - a common ploy among LED "pads").

Here are a few examples ...  '9 Joules/cm2 in 90 seconds' ... or '60 Joules in 90 seconds' ... or '80 Joules/cm2, per session'. None of these are worthy of comparison or consideration. Sorry, we know many of you have worked so hard, and have done so much note-taking homework already ... based on dupery. In fact, in response to the 'Numbers Game' one popular photorejuvenation machine distributor boasted two very different specifications in the space of a single year -- without a single design or part revision. They simply "recalculated" the math.

Now here's a specification for one of our standard photorejuvenation heads, driven by the actual DermaWave circuitry ...

28.4 joules/cm2 (per square centimeter) @ 610nm, 60 seconds, at surface (actual skin surface, not LED dome surface).

If you don't see the kind of specicifity that we've provided above, then any nebulously incomplete ratings you encounter can be ignored and, indeed, should be ...

In a quick related aside, it gets worse ... Because there's no independent review of equipment in this industry (such as there is for cameras, audio equipment, and automobiles - toasters, even), too many people in this field are free to simply 'make it up', as they go - knowing that there's no one to actually check the specification claims, least of all ... you.  And, no ... the FDA doesn't confirm specification parameters.
888 - 704 - 5888

Oh, yeah ... Free Shipping, too.

  HOME       cello      cubic 7      heads       power      design studio      results     microcurrent      articles     contact