There are trade-offs. The Energizer 6 LED headlight does OK for me, with two reds doing OK at a slower pace. The Myo XP Belt from Petzl, having the battery pack you can tuck inside your jacket on a cold night, holds up MUCH longer in cold weather, is powerful enough to make outrunning your beam unlikely even on a quicker run, but lacks a night vision/red/green LED currently. It's a little bulkier but with the bulk off your head. I picked up a cheap green LED headlight fitting under the bill of a cap recently, working fine for outside chores but so far untested on a run.
Hmmm... I have 2 uses for a headlamp: night running and stargazing. Considering that last Friday night I spent several hours stargazing in sub -10 F weather (yes, you're reading that right. Some people think I'm insane for running for hours and hours. Those who're close to me find the stargazing I do to be more insane - see my article from a couple years ago here, page 19: http://www.nightskyobserver.com/Photon/Download/Photon_Issue5.pdf ), holding up to cold weather is a very attractive feature. Does it hold up longer because of the type of battery pack it is or because the battery pack is not as cold when in your coat? We talked before about attaching our own red filters to a headlamp, so I'd consider that if the MYO XP doesn't have a red LED or filter. I assume the cord going from the lamp to the battery pack is not too much of a nuisance?
I've always used headlamps that have an extra strap that runs over the top of my head. Many of the lamps I'm considering don't have this. Will they hold their position well while running?
