*VW Misinformation*
There's a thread going around elsewhere on the forum titled "Prowattie mod....I don't Think So!" Before this misinformation gets out of hand I thought I'd take the opportunity to refute it. Here's the scoop:
VW vs VV - The Basics
Variable wattage allows the user to set the "heat" of the coil; variable voltage provides a range of voltage settings to said coil. Variable wattage maintains a constant temperature at the coil, variable voltage maintains a constant voltage.
Ok, with that said what's the problem? Well, apparently the poster, who fancies himself a "fact gatherer" and with whom I've had several PM conversations, is convinced that it's impossible to maintain a constant wattage, given that the coil's resistance varies with time and temperature, etc. How he comes to this conclusion is unclear, but he does it in a manner which might convince non-technical minded folks. That's a shame, 'cause he's flat out wrong. Here's why:
In order to maintain a constant wattage at the coil, the circuitry must compensate for resistance changes. Ohn's Law simply states that P (watts) = V (voltage) X I (current). Now, we can stabilize for a given voltage, which VV devices such as the Provari do, but if the coil's resistance changes, which it will, then the current (I) will be affected. More resistance, less current, lower wattage. Less resistance, more current, higher wattage. So, for any given vape, the heat at the coil will change as the resistance changes. Simple as that. Doesn't matter if the voltage is smack dead on, or pulsing all over the place, the wattage (power, heat) will change.
The DNA 20 has something which, as far as I'm aware, no other VW device can match, and that's it's ability to adjust voltage to changing resistance levels in milliseconds. Using an ARM-based processor it checks the coil's resistance up to, I believe, 10,000 times a second and makes the necessary voltage adjustments to keep the current at a level which produces the desired wattage. Other VW systems check the resistance once, when the fire button is activated, and provide the same voltage level for the duration of the vape. This is certainly VW, but not the kind you're gonna enjoy very much.
This is why, imho as well as many others', the DNA 20 is the superior power regulation system. You're guaranteed a consistent heat level throughout any given vape. VV systems, no matter how good (and the Provari is the best), can't say the same.
I'm not going to engage in a point-by-point rebuttal of his argument, but suffice it to say his "facts" are wrong. I will say, however, and I've said it many times, that the Provari is an extremely fine device and worthy of all the kudos it's received over the years. But it's apples and oranges - plasma vs. LCD. Different systems for different folks. Some will find VV provides the type of vape they're looking for, others VW. This isn't some Battle Royale, just two different ways for us to enjoy our new habit - I mean hobby.
Addendum - Some seem to believe that that the DNA 20 doesn't regulate wattage in real time. Well, it does, or as close to real time as practically possible. *That's the benefit!* If it only did it once, or occasionally, then most of the advantage of VW would be lost. The ability to change coils and still maintain a given wattage is great, but the real advantage is the constant, never wavering heat at the coil while you're vaping. That's the DNA 20 difference, and it is very, very real. End rant.