More lumens always means shorter battery time. There is one standard that some makers use for run-time, and that is the time from 100% to 10% of the original output. Now with drivers you can get some lights that will dump most of the battery right at once, so you get a runtime of say 1-2 hours, or you get an unregulated light (led lenser does this) and you get the same output, same battery but a runtime of 10 hours. Of course for most of that you have a dimmer light than the first option. If you see FL-1, that at least gives you an idea of how they measured it, if not, they may have just made the number up.
As for output, its up to you, I like about 50 lumens for most tasks, on most days, but its nice to have more from time to time. In general 200 is "dark parking lot" bright, and everything after that is "SAR/tactical" so there is no need for lights to be between those points, if you are going to carry a light the size of an old school mag, it might as well look like the sun. Just like 6-10 seems like a good "find the key for the door" light. Humans are pretty close in needs. I have a Fenix TK41c that I picked up for playing out in the woods, and yep, it makes a good spotlight, at its 1000 lumen max, but its never proved super useful. Its 350 setting was still too bright to walk by alone, and was only useful to assist walkers well ahead of me who had very poor headlamps. With me 20-30 meters behind them, there was enough ambient light for them to easily walk.
I'm partial to Fenix lights, right now pretty much all my lights are AA or AAA just for ease of maintaining a collection of rechargeables that work around the house, and I know I can always get them. But nitecore does good work as well.
There are getting to be a lot more USB charged lights on the market. You will sacrifice some size and weight for the control circuit, but the convenience may be worth it for a light you can keep topped off.