In reply to mattc:
Myo RXP isn't much better or worse that similar torches in terms of battery life I've found. At least comparing it to other torches my mates use. There used to be a problem where the wire entered the lamp casing that a lot of people experienced failure with (in earlier models) but I've never had that problem myself.
Fenix HP20 is another I use and it's beam is substantially brighter / longer range than the MYO RXP, but also much narrower and so I don't like it so much for walking along trails or looking at the next few moves / meters of a climb. Great for distance though! Battery life seems equivalent to the MYO on average, but shorter on high setting.
BD Icon is another I like (and the Polar Icon once I got over the difference of having the separate battery pack), good beam, good close range. Annoying that it doesn't remember brightness settings though. Also good that you can lock it so that it doesn't come on accidentally.
Red light is OK for tracks and trails if you want to preserve night vision and reduce battery consumption, but it's not powerful enough for climbing with imo. Used it last week for wandering down through caves on Picco Lagazuoi, and it was just enough for that. Red light is also pretty poor / useless for nav I find as the red light makes contour lines disappear / fadeout. Maybe not a problem if you're only following trails, rivers or other similar features, but a real pain if you're trying to read the terrain!
Of the three I prefer the Icon.
It's difficult to compare torch battery lives via the published data as they don't all use the same system of measurement. There was a good gear article on here that compared quite a few, and a follow up on how the reactive torches work as well that's well worth a read.
Cheers,
Stuart