VV or VW is a good thing to have but the power consumed by the atomizer coil is only part of the story. The T4 runs hotter (sometimes too hot for my taste) but I get more vapor and a more satisfying experience overall from the E-smart. It seems more efficient somehow. I especially like the E-smart clearo and battery together even though it's a fairly cool-running system (the E-smart batteries are regulated at 3.6V output). It doesn't scorch my juices like a T4 fitted to a G6 or Triton battery, both of which are 3.7V nominal or 4.2V at full charge.
As for the difference in coil resistance between the two clearos, I should point out that the actual number can and does vary from the nominal. (In the circuit design biz we call this "manufacturing spread"). I measured seven samples each of T4s and E-smarts with the following results:
T4: 2.3, 2.3, 2.4, 2.4, 2.4, 2.4, 2.5, AVG = 2.38
E-smart: 2.3, 2.6, 2.7, 2.7, 2.7, 2.7, 2.9 AVG = 2.65
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