No there are some tube 5v and VV mods , for Ego types (3.4-3.7) you want LR (1.7-2 Ohm) for > 4v you want 2.5-3.5 Ohm Standard Resistance (to oversimplify a bit) this gives you a warmer vape with clouds of vaper usually
Ohms- Heat 3.0 Ohms on an Ego is a very cool vape without a bunch of vaper (usually) where 2 or 1.7 is warmer with more vaper , you don't need LR (to simulate higher voltage when you HAVE higher voltage so 3 ohm is nice @ 4 - 5 volt with most joose)