"L-Rider Robust limited to 9 watts
I have a Robust and it doesn't perform well with high resistances. I knew it must have some limitation but it's not documented anywhere. I wanted to figure out what the limit is so I know what will work well on it.
PBusardo recently reviewed the Robust and showed voltage measurements at several resistances:
1.5 ohm gets 3.7 V maximum, set it higher and you still get 3.7
2.2 ohm gets 4.5 V max
3.0 ohm gets 5.2 V max
All right but what does that tell us about the limitation? Use the numbers to calculate power with P = V^2 / R. All three loads work out to 9.1W power. The Robust doesn't have an amp limit like some devices, it has a watt limit. It can't supply more than 9.1W.
This means above 2.0 ohms, you are not going to get a quality vape. High resistance cartos/atomizers require higher voltage but the Robust won't supply these voltages because the power limit will kick in. I've tried 2.2 ohm cartos on my Robust and they are a bit too weak. They need a little more voltage than the 4.5V being supplied. However at 2.0 ohm it works great. Also, dual coil is a bad idea. 9W is barely enough for one coil, splitting it between two coils won't work.
Now I'm not saying the Robust is a bad device. I love mine, it's small and lightweight yet it has a ton of features. Just keep in mind it works best with 2.0 ohm or lower, and single coil only. I use a rebuildable atomizer with a 1.8 ohm coil and it works great."
http://www.e-cigarette-forum.com/fo...503-l-rider-robust-limited-9-watts-print.html
