When you look at lights you do have to figure out how long you need it to run for at night, I like the Phillips but I never ride for more than two hours anyways after dark...but I also rarely put it on high so on low it will run for 8 hours, so for me I have more battery then I'll ever need on a ride.

Keep in mind that those lights that are 2 to 4 times brighter (in the MTBR beamshot comparisons) are a lot more expensive and they have a separate battery that you have to mount to the bike. For some people mounting a battery and having another run of wire on a bike is no big deal, it isn't a big deal for me either, but I prefer not having a separate battery, but for others they may hate the idea of a separate battery.

Performance has a decent sale on a couple of decent lights; this one is the brightest but has a separate bat pack, decent run time on medium and low: http://www.performancebike.com/bikes...42508__1842508

The next one has slightly lower run times but has a self contained bat: http://www.performancebike.com/bikes...42508__1842508