Dee is completely correct, of course … and as always too.
In the “old days,” photographers would have to adjust shutter speed and aperture opening (based on film “speed”). And, this is a perfect metaphor of what Dee is talking about. (Yeah, I used to run-around with my “light meter!”)
If your camera “lens opening” is very small, (like low current levels), you need a longer “exposure time,” and that’s what those of us that use “analog blend” are doing.
Now, if the camera lens is “wide open” (like very high current … or lots of light coming in), your shutter speed has to be much faster (and that’s what Dee is doing).
All-in-all, it ends up being somewhat the same. This formula was the basis of early camera work … and the basis of what we do with the thermolysis current as well.
Of course with digital cameras this is done automatically … This is not exactly like the digital E-machines, however, because the “human eye” (with expert experience), is still watching the skin being treated, and making careful adjustments.
So, don’t worry about NOTHIN’!!!