I will give my two cents having been the night observer on the summit for sometime, I have used a lot of headlamps. If you are looking at the LLBean site for two, I have only tried two they have. The first is the Petzl Tikka Plus and the Black Diamond Icon. Two other Black Diamond brands I have used up here is the Cosmo/Moxie Headlamp and the Lunar model (which I am not sure they still make). And lastly, my personal one is the Princeton Tec Apex Pro. Overall, they all give off plenty of light and work good enough for what they are for. But there are a couple things to consider. Brightness: if you are looking for a really bright light, the Black Diamond Icon and Princeton Tec Apex series are tops. Downside is though, if you want to extend battery life, brighter is not always a great thing. Rechargable batteries: while we do not use rechargable batteries on the Obs lamps because of the short life they have in the cold, when I was researching mine, the Petzl did have a lot of complaints of battery explosions. I went with the Apex Pro since every review they had said they had heat sink technology which is key. The last thing to consider is summer vs. winter. If you are using if for a three season headlamp, batteries on you head are fine. If you are using it for winter, look for a battery pack that goes in your coat to keep the batteries up for longer.
Out of all the ones I tried, my personal one is the one I would recommend above all others. It was about 60.00 with free shipping on Sunnysports.com. Kind of pricey but if you read up on it, it is well worth it. I probably should have gone with the extreme version for better use in the winter but the pro is so much lighter.
Staff Meteorologist/Night Observer, KMWN (Mt Washington Obs., NH)