If you’re commuting, seriously consider the Sirius instead of a Joystick. The beam pattern is far more useful for a road-friendly bar light.
Assuming off-road / MTB bar lights, I’m happy with a Mk5 MaxxD (1600Lm) paired with a Mk8 Joystick on top, that’s quite enough light and burn time for me although ultimate power lights have moved on a long way the last couple of years so 1600Lm isn’t quite so ‘OMG! SO BRIGHT!’ anymore.
It’s a very divisive subject whether you should have a brighter light on the bars or your helmet, or indeed if both should be equal. I’d advise personal experimentation on this once you have the lights, as your preferences may well differ from the person telling you what works for them. It’s also worth considering if you often nightride in a group or usually solo. If in a group and your companions’ lights are significantly different in output to yours, you are either going to have a bad time never seeing what you wanted to see or you’ll do the same to them…