VV will allow you to TUNE into an atty hence there is no need to have several OHM attys
LR attys were designed for 3.7 volt devices.
What really matters is the POWER you are putting into the atty , as an example a LR atty @ 1.7 ohms and 3.7 volts is 8 WATTS ( 2.17 amps ) .
A 3 ohm atty at 4.9 volts is 8 Watts ( 1.6 amps of current), see how the voltage can adjust to set the Power for you.
The one drawback of LR attys is an increase in current draw , this will drain a battery FASTER than higher voltage .
Hope this made sense ???
The voltage makes a difference in hit and performance... Yes you can "dial in" voltage... The point was that if she wants to experience 5v vaping, for example, using her existing 1.5 ohm atties is a bad idea. She could dial-down to 3.4 ish volts, but why? Just get another eGo type device then. Assuming she only has LR atties on hand, she will need to get at least higher ohm atties to experiment with. She wouldn't want to vape an LR atty at 1.5 ohms on even a 3.7 volt setting IMO. See post # 4
Anne, as for draw... you'll need to experiment. I suggest genuine joye 510 3.0 ohm atties as an experiment. There are many others tho, and it is so subjective that I can't really say or haven't tried em all. But the 1.5 ohms you are using probably won't work for anything other than the lowest voltages per the math above.
So, buzzkill is correct, you can dial it in. However, your new atty standard will not be an LR, even if you settle on one ohm/brand atty. With the 3.0 ohm atties, you can still dial the voltages around a bit to you liking.... more hit vs more flavor, for example. Others like 2.5 ohm atties. It's real subjective as to draw.
So to clarify... I don't mean that you need an array of different ohm atties, but I do mean that you will have at least 2 sets; the ones you have now at 1.5 ohms, and another set at higher (3.0? or whatever) ohms. They could be a different color so you can tell them apart. Since you are concerned about draw, try different manufacturers too.
Hope this helps rather than confuses. Good Luck!