4.8 - 5V with 3 ohms -- right around 8W, lots of vapor, nice warmth. When people wonder what HV is like, I suggest trying a true "dumb" passthrough, with 2A USB power supply -- under $25 total (I already have 3 ohm stuff, as an 808 user).
If the PT works well for you, then it's time to look for a 5V mod, or, better yet, a variable voltage, in the future